Document:

<PAGE>   1
                                                           EXHIBIT 4 (ii)(a)(11)

                       FIRST AMENDMENT TO TRUST INDENTURE

         This FIRST AMENDMENT TO TRUST INDENTURE dated as of September 14, 2000
(this "First Amendment") is entered into among (1) GREAT RIVER CRUISE LINE,
L.L.C., a Delaware limited liability company ("Mortgagor"), (2) THE FINANCIAL
INSTITUTIONS LISTED ON THE SIGNATURE PAGES HEREOF AS LENDERS (the "Lenders"),
and (3) THE CHASE MANHATTAN BANK, a New York banking corporation, not in its
individual capacity, but as Trustee under the Trust Indenture specified below
(the "Trustee").

                             PRELIMINARY STATEMENTS

         A. THE DELTA QUEEN STEAMBOAT CO., a Delaware corporation ("Borrower")
has previously entered into a Credit Agreement dated as of February 25, 1999,
with certain lenders, The Chase Manhattan Bank, as Administrative Agent and
Hibernia National Bank, as Documentation Agent (as previously amended, the
"Original Credit Agreement"). The Borrower, the Lenders and The Chase Manhattan
Bank, as agent, have entered into an Amended and Restated Credit Agreement dated
as of September 14, 2000 (as amended, supplemented, modified or restated from
time to time (the "Amended and Restated Credit Agreement").

         B. The Mortgagor is the sole owner of the whole of the Vessel "Delta
Queen", consisting of 3,360 gross tons, 1,160 net tons, bearing official number
225875, documented in the name of the Mortgagor under and pursuant to the laws
of the United States of America, having its home port at New Orleans, Louisiana
(the "Vessel").

         C. The parties hereto have previously entered into a Trust Indenture
dated February 25, 1999 (the "Original Trust Indenture"), whereunder the Trustee
agreed on behalf of Lenders to hold that certain Preferred Ship Mortgage dated
as of February 25, 1999, by Mortgagor in favor of The Chase Manhattan Bank, as
Agent and as Trustee under the Original Trust Indenture (the "Original
Mortgage"), which Original Mortgage was recorded with the National Vessel
Documentation Center of the United States Coast Guard on March 4, 1999 at 2:38
P.M. in Book 99-25, Page 533, and which Original Mortgage affected 100% of the
interest of Mortgagor in the vessel "Delta Queen", Official No. 225875.

         D. In accordance with the Amended and Restated Credit Agreement,
Mortgagor has executed a First Amendment to Preferred Ship Mortgage dated as of
September 14, 2000 (the "First Amendment to Mortgage") reducing the maximum
amount secured under the Original Mortgage, as amended, to $30,000,000 and
providing for changes in the Financial Institutions that are parties to the
Amended and Restated Credit Agreement.

         E. In connection with the execution and delivery of the Amended and
Restated Credit Agreement and the First Amendment to Mortgage it is necessary to
amend the Original Trust Indenture. The Original Trust Indenture, as amended by
this First Amendment, is called the "Amended Trust Indenture."

                               Page 1
<PAGE>   2

         NOW THEREFORE, in consideration of the premises and for good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereby agree as follows:

         SECTION 1. AMENDMENT TO ORIGINAL MORTGAGE. Mortgagor, Lenders and the
Trustee hereby acknowledge and consent to the execution and delivery of the
First Amendment to Mortgage and the modification and amendments contained
therein. The provisions of the First Amendment to Mortgage are hereby
incorporated herein by reference with the same force and effect as if said
instrument was fully set forth herein.

         SECTION 2. CHANGES IN LENDERS. Mortgagor, Lenders and the Trustee
hereby acknowledge that Bank One, Louisiana, National Association, Credit
Agricole Indosuez and The Bank of New York were parties to the Original Trust
Indenture but are not parties to the Amended and Restated Credit Agreement.
Furthermore, National City Bank of Michigan/Illinois has been added as a new
party to the Amended and Restated Credit Agreement. Accordingly, the Original
Trust Indenture is hereby modified and amended to reflect the deletion of Bank
One, Louisiana, National Association, Credit Agricole Indosuez and The Bank of
New York and the addition of National City Bank of Michigan/Illinois as parties
to the Amended and Restated Credit Agreement. The parties further acknowledge
and agree that, as of the date hereof, the Lenders specified under the Amended
Trust Indenture shall be The Chase Manhattan Bank, Hibernia National Bank and
National City Bank of Michigan/Illinois.

         SECTION 3. EFFECTIVENESS. Except as amended and modified by this First
Amendment, the Trust Indenture is in all respects ratified, confirmed and
carried forward and it shall be and remain in full force and effect. Nothing
herein shall constitute a novation, release, termination or reissuance of the
Trust Indenture, or a novation of the indebtedness evidenced by the Original
Credit Agreement. Terms not otherwise defined herein shall have the meanings
provided in the Original Trust Indenture.

         SECTION 4. COUNTERPARTS. This First Amendment may be executed in any
number of counterparts, each of which when so executed shall be deemed to be an
original and such counterparts, added together, shall constitute and be one and
the same instrument.

                  [Remainder of Page Intentionally Left Blank]

                                     Page 2
<PAGE>   3

                          [Signature Page of Mortgagor]

         IN WITNESS WHEREOF, Great River Cruise Line, L.L.C. has caused this
instrument to be duly executed by an authorized officer as of the date first
written above.

WITNESSES:                           GREAT RIVER CRUISE LINE, L.L.C.

                                     BY:      THE DELTA QUEEN STEAMBOAT CO.,
                                              A DELAWARE CORPORATION,
                                              AS MANAGING MEMBER

/s/ Shahem Zenni                              /s/ JORDAN B. ALLEN
-------------------------                     ----------------------------------
                                              NAME:    JORDAN B. ALLEN
/s/ Pam Stringer                              TITLE:   EXECUTIVE VICE PRESIDENT
-------------------------                           ----------------------------

                                     BY:      DQSB II, INC.
                                              A DELAWARE CORPORATION,
                                              AS MANAGING MEMBER

                                              /s/ JORDAN B. ALLEN
                                              ----------------------------------
                                              NAME:    JORDAN B. ALLEN
                                              TITLE:   EXECUTIVE VICE PRESIDENT
                                                    ----------------------------

                                     Page 3
<PAGE>   4

                           [Signature Page of Trustee]

         IN WITNESS WHEREOF, The Chase Manhattan Bank has caused this instrument
to be duly executed by an authorized officer as of the date first written above.

WITNESSES:                                  THE CHASE MANHATTAN BANK,
                                            AS TRUSTEE

/s/ Alexander Schneider                     /s/ JONATHAN E. TWICHELL
--------------------------------            ------------------------------------
                                            NAME:    JONATHAN E. TWICHELL
/s/ Mary C. Lum                             TITLE:   VICE PRESIDENT
--------------------------------                  ------------------------------

                                     Page 4
<PAGE>   5

                           [Signature Page of Lenders]

         IN WITNESS WHEREOF, The Chase Manhattan Bank has caused this instrument
to be duly executed by an authorized officer as of the date first written above.

WITNESSES:                                  THE CHASE MANHATTAN BANK

/s/ Alexander Schneider                     /s/ JONATHAN E. TWICHELL
------------------------------              ------------------------------------
                                            NAME:    JONATHAN E. TWICHELL
/s/ Mary C. Lum                             TITLE:   VICE PRESIDENT
------------------------------                    ------------------------------

                                     Page 5
<PAGE>   6

                           [Signature Page of Lenders]

         IN WITNESS WHEREOF, Hibernia National Bank has caused this instrument
to be duly executed by an authorized officer as of the date first written above.

WITNESSES:                                  HIBERNIA NATIONAL BANK

/s/ Vivian Cassesi                          /s/ CHERYL H. DENENEA
------------------------------              ------------------------------------
                                            NAME:    CHERYL H. DENENEA
/s/ Angela Dominguez                        TITLE:   VICE PRESIDENT
------------------------------                    ------------------------------

                                     Page 6
<PAGE>   7

                           [Signature Page of Lenders]

         IN WITNESS WHEREOF, National City Bank of Michigan/Illinois has caused
this instrument to be duly executed by an authorized officer as of the date
first written above.

WITNESSES:                                  NATIONAL CITY BANK OF
                                            MICHIGAN/ILLINOIS

/s/ Donna L. Benson                         /s/ STEPHANIE PASS
----------------------------                ------------------------------------
                                            NAME:    STEPHANIE PASS
/s/ L. Schultz                              TITLE:   VICE PRESIDENT
----------------------------                      ------------------------------

                                     Page 7
<PAGE>   8

                                 ACKNOWLEDGMENT

STATE OF ILLINOIS

COUNTY OF COOK

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                                Jordan B. Allen,

the duly authorized Executive Vice President and representative of The Delta
Queen Steamboat Co., which said corporation is a managing member of Great River
Cruise Line, L.L.C. ("Great River"), who declared under oath that he is the duly
authorized representative of Great River and its aforesaid managing member, and
that he signed the foregoing instrument with full authorization under the
articles of organization of Great River and the board of directors of the
managing members, and that the foregoing Amendment to Trust Indenture is the
free and voluntary act and deed of Great River and its managing members, as well
as said appearer in his capacity as the representative of Great River, for the
uses, purposes and covenants therein expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 13th day of September, 2000.

/s/ Barbara A. Shafer
-------------------------------------
NOTARY PUBLIC
My Commission Expires: 11/3/01
                       -------

                                     Page 8
<PAGE>   9

                                 ACKNOWLEDGMENT

STATE OF ILLINOIS

COUNTY OF COOK

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                                Jordan B. Allen,

the duly authorized Executive Vice President and representative of DQSB II,
Inc., which said corporation is a managing member of Great River Cruise Line,
L.L.C. ("Great River"), who declared under oath that he is the duly authorized
representative of Great River and its aforesaid managing member, and that he
signed the foregoing instrument with full authorization under the articles of
organization of Great River and the board of directors of the managing members,
and that the foregoing Amendment to Trust Indenture is the free and voluntary
act and deed of Great River and its managing members, as well as said appearer
in his capacity as the representative of Great River, for the uses, purposes and
covenants therein expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 13th day of September, 2000.

/s/ Barbara A. Shafer
----------------------------------
NOTARY PUBLIC
My Commission Expires: 11/3/01
                       -------

                                     Page 9
<PAGE>   10

                                 ACKNOWLEDGMENT

STATE OF ILLINOIS

COUNTY OF COOK

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                              Jonathan E. Twichell,

the duly authorized Vice President and representative of The Chase Manhattan
Bank, who declared that he/she is the duly authorized representative of The
Chase Manhattan Bank and that he/she signed the above instrument on the
authorization of such corporation's board of directors and that the same is the
free and voluntary act and deed of said corporation, and of himself/herself in
his/her capacity as representative thereof, for the uses and purposes therein
expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 12th day of September, 2000.

/s/ Deborah K. Welles
--------------------------------------
NOTARY PUBLIC
My Commission Expires: 3/10/02
                       -------

                                    Page 10
<PAGE>   11

                                 ACKNOWLEDGMENT

STATE OF LOUISIANA

PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                               Cheryl H. Denenea,

the duly authorized Vice President and representative of Hibernia National Bank,
who declared that he/she is the duly authorized representative of Hibernia
National Bank and that he/she signed the above instrument on the authorization
of such corporation's board of directors and that the same is the free and
voluntary act and deed of said corporation, and of himself/herself in his/her
capacity as representative thereof, for the uses and purposes therein expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 13th day of September, 2000.

/s/ Gary Ryan
--------------------------------------
NOTARY PUBLIC
My Commission Expires: at death
                      ---------

                                    Page 11
<PAGE>   12

                                 ACKNOWLEDGMENT

STATE OF ILLINOIS

COUNTY OF DUPAGE

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                                 Stephanie Pass,

the duly authorized Vice President and representative of National City Bank of
Michigan/Illinois, who declared that he/she is the duly authorized
representative of National City Bank of Michigan/Illinois and that he/she signed
the above instrument on the authorization of such corporation's board of
directors and that the same is the free and voluntary act and deed of said
corporation, and of himself/herself in his/her capacity as representative
thereof, for the uses and purposes therein expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 13th day of September, 2000.

/s/ Frances S. Griffin
-----------------------------------------
NOTARY PUBLIC
My Commission Expires: 12/29/01
                       --------

                                    Page 12<PAGE>   1
                                                            EXHIBIT 4(ii)(a)(12)

================================================================================

                               FIRST AMENDMENT TO
                             PREFERRED SHIP MORTGAGE

                     ON 100.000% OF THE VESSEL "DELTA QUEEN"
                             OFFICIAL NUMBER 225875

                                   EXECUTED BY
                         GREAT RIVER CRUISE LINE, L.L.C.

                                   IN FAVOR OF
                            THE CHASE MANHATTAN BANK,
                   AS AGENT AND TRUSTEE FOR THE BENEFIT OF THE
                    FINANCIAL INSTITUTIONS DESIGNATED IN THE
                                 TRUST INDENTURE
                    DATED AS OF FEBRUARY 25, 1999, AS AMENDED

                   EXECUTED ON THE 14TH DAY OF SEPTEMBER, 2000

                    OBLIGATIONS SECURED, DIRECT OR CONTINGENT
             (EXCLUSIVE OF INTEREST, EXPENSES AND FEES) PURSUANT TO
               46 U.S.C.A. SS. 31321(B)(3) AND 46 CFR SS. 67.235,
                           MAXIMUM PRINCIPAL BALANCE:
                                   $30,000,000

VESSEL NAME:               DELTA QUEEN
HOME PORT:                 NEW ORLEANS, LOUISIANA
GROSS TONNAGE:             3,360 TONS
NET TONNAGE:               1,160 TONS
YEAR BUILT:                1926

OWNER AND MORTGAGOR:               MORTGAGEE:
--------------------               ----------

GREAT RIVER CRUISE LINE, L.L.C.    THE CHASE MANHATTAN BANK,
ROBIN STREET WHARF                      AS AGENT AND TRUSTEE FOR THE BENEFIT
1380 PORT OF NEW ORLEANS PLACE          OF THE FINANCIAL INSTITUTIONS DESIGNATED
NEW ORLEANS, LOUISIANA 70130-1890       HEREIN (TIN: 13-499-4650)
                                   270 PARK AVENUE
                                   NEW YORK, NEW YORK 10017

================================================================================

<PAGE>   2

FIRST AMENDMENT TO                                      UNITED STATES OF AMERICA
PREFERRED SHIP MORTGAGE
                                                               STATE OF ILLINOIS
BY:
                                                                  COUNTY OF COOK
GREAT RIVER CRUISE LINE, L.L.C.

IN FAVOR OF:

THE CHASE MANHATTAN BANK, A NEW YORK
BANKING CORPORATION, AS AGENT AND
TRUSTEE (IN SUCH CAPACITY, "AGENT") FOR
ITSELF AND THE FINANCIAL INSTITUTIONS
DESIGNATED IN THE TRUST INDENTURE DATED
AS OF FEBRUARY 25, 1999, AS AMENDED

     BE IT KNOWN, that on the 14th day of September, 2000, in the presence of
the undersigned competent witnesses, personally came and appeared:

     GREAT RIVER CRUISE LINE, L.L.C., a Delaware limited liability company (the
     "Owner" and "Mortgagor") whose mailing address is Robin Street Wharf, 1380
     Port of New Orleans Place, New Orleans, Louisiana 70130, whose taxpayer
     identification number is 72-1353488, successor by merger to GREAT RIVER
     CRUISE LINE, INC., a Delaware corporation, as evidenced by Certificate of
     Merger filed with the Delaware Secretary of State on December 27, 1996, but
     effective as of December 31, 1996, represented herein by and through The
     Delta Queen Steamboat Co., a Delaware corporation, a managing member,
     itself appearing through ____________________________, its executive vice
     president and duly authorized representative pursuant to a resolution of
     its board of directors, a certified copy of which is attached hereto, and
     DQSB II, Inc., a Delaware corporation, a managing member, itself appearing
     through _____________________, its executive vice president and duly
     authorized representative pursuant to a resolution of its board of
     directors, a certified copy of which is attached hereto; which managing
     members are authorized under the terms of Owner's operating agreement and a
     unanimous consent resolution of its managing members, a certified copy of
     which is attached hereto;

     WHO DECLARED that this First Amendment to Preferred Ship Mortgage (this
"First Amendment") is hereby granted, subject to the following premises, terms
and conditions:

                             PRELIMINARY STATEMENT:

         A. Mortgagor has previously granted that certain Preferred Ship
Mortgage dated February 25, 1999 (the "Original Mortgage," together with any
amendments thereto, including this First Amendment, "Mortgage"), which Original
Mortgage was recorded with the National Vessel Documentation Center of the
United States Coast Guard on March 4, 1999 at 2:38 P.M. in Book 99-25, Page 533;
and

                                     Page 2
<PAGE>   3

         B. The Original Mortgage was granted to secure payment of the
Obligations (as defined therein), up to a maximum secured principal amount of
$70,000,000.00, together with interest, costs, attorneys' fees and protective
advances, which Obligations included all indebtedness of Mortgagor under the
Subsidiary Guaranty dated February 25, 1999 (together with any amendments
thereto, and renewals and replacements thereof, the "Guaranty"); and

         C. Such Guaranty guaranteed payment of all of the indebtedness of The
Delta Queen Steamboat Co. ("Borrower") under that certain Credit Agreement dated
as of February 25, 1999, by and among Borrower, Mortgagee and the other
Financial Institutions listed on the signature pages thereof, supplemented or
otherwise modified from time to time (the "Credit Agreement"); and

         D. Borrower and Mortgagor have requested that the principal amount of
the credit facility under the Credit Agreement be modified and reduced from a
maximum of $70,000,000.00 to a maximum of $30,000,000.00, and to further amend
the Credit Agreement with respect to certain other matters, all to be more fully
reflected in an Amended and Restated Credit Agreement by and among Borrower,
Mortgagee and the other Financial Institutions, dated as of SEPTEMBER 14, 2000
(the "Restated Credit Agreement" or "Credit Agreement"); and

         E. Mortgagor wishes to provide and confirm that the Obligations secured
by the Mortgage include all obligations guaranteed by Mortgagor under the
Guaranty, which include, without limitation, all of the indebtedness of Borrower
under the Credit Agreement, up to a maximum secured principal amount of
$30,000,000.00, together with interest, costs, attorneys' fees and protective
advances;

         NOW THEREFORE, in consideration of the premises and to provide for and
evidence the amendment and modification of the Original Mortgage, Mortgagor
hereby agrees as follows:

         SECTION 1. GUARANTEED OBLIGATIONS. Mortgagor hereby acknowledges and
confirms that the "Guaranteed Obligations" which are secured by its Guaranty,
and which comprise the "Obligations" secured by the Mortgage, were intended to
include, and do now and shall hereafter include, any and all Obligations of
Borrower under the Credit Agreement (up to the maximum principal limits provided
herein), as the same Credit Agreement is amended, restated, supplemented or
otherwise modified from time to time, including any amendments to the Credit
Agreement that increase the amount of the credit facility thereunder, change the
interest rate, change the maturity dates, or that effect other changes of
whatever nature and kind whatsoever. In accordance with the foregoing, and
without limiting the foregoing, Mortgagor confirms and acknowledges that the
"Guaranteed Obligations" secured by the Guaranty, and the "Obligations" secured
by the Mortgage, were intended to include, and do now and shall hereafter
include, any and all obligations, whether for principal, interest, fees and
other amounts, that may now or hereafter be due from Borrower in connection with
the Restated Credit Agreement, as amended, restated, supplemented or otherwise
modified from time to time, all up to a maximum secured principal amount of
$30,000,000.00, together with interest, costs, attorneys' fees and protective
advances.

                                     Page 3

<PAGE>   4

         SECTION 2. OBLIGATIONS SECURED BY MORTGAGE. The Mortgage is hereby
modified and amended to provide that the maximum principal obligations secured
thereunder, whether direct or contingent, exclusive of interest, expenses and
fees, pursuant to 46 U.S.C.A.ss.31321(b)(3) and 46 CFR ss.67.235(a)(2)(iii) is
reduced from $70,000,000 to $30,000,000.00.

         SECTION 3. BORROWINGS SECURED. It is the intention of Mortgagor that
all Borrowings made under the Original Credit Agreement (including all
Borrowings made under the Restated Credit Agreement), together with any and all
other "Obligations" as described in the Original Mortgage and confirmed herein,
are secured under the Mortgage, as amended, with retroactive priority to the
date of the Original Mortgage, in conformance with the provisions of applicable
law, up to a maximum principal secured amount of $30,000,000.00, together with
interest, costs, attorneys' fees and protective advances.

         SECTION 4. NOTICE OF MORTGAGE. Section 1.8 of the Original Mortgage is
hereby amended, modified and supplemented by deleting the Notice of Preferred
Ship Mortgage as set forth therein and replacing it with the following:

         NOTICE OF PREFERRED SHIP MORTGAGE

         This Vessel is owned by Great River Cruise Line, L.L.C. and is subject
         to a Preferred Ship Mortgage, dated February 25, 1999, as amended, in
         favor of The Chase Manhattan Bank, as Agent and Trustee pursuant to a
         Trust Indenture dated as of February 25, 1999, as amended, among the
         aforesaid Agent and Trustee, as Mortgagee, and the financial
         institutions designated therein, under authority of Title 46 U.S.C.A.
         ss.31301 et seq. Under the terms of said Mortgage, as amended, neither
         the Owner, any charterer, the Master, nor any other Person has any
         right, power or authority to create, incur or permit to be placed or
         imposed upon this Vessel, its freights, profits or hire, any lien
         whatsoever, other than the lien of, and liens permitted by, said
         Mortgage, as amended.

         SECTION 5. EFFECTIVENESS. Except as amended and modified by this First
Amendment, the Mortgage is in all respects ratified, confirmed and carried
forward and it shall be and remain in full force and effect. Nothing herein
shall constitute a novation, release, termination or reissuance of the Mortgage,
or a novation of the indebtedness evidenced by the Original Credit Agreement.
Terms not otherwise defined herein shall have the meanings provided in the
Original Mortgage.

         SECTION 6. PROVISION CONCERNING TRUST INDENTURE. This First Amendment
and the Mortgage have been executed and delivered to Mortgagee in trust, and are
held by Mortgagee in trust, pursuant to that certain Trust Indenture by and
among Mortgagor, Mortgagee and the Financial Institutions, dated February 25,
1999, as the same may be amended from time to time, including the First
Amendment to Trust Indenture dated of even date herewith.

         SECTION 7. FILING. Mortgagor hereby authorizes and directs that this
First Amendment be filed with the National Vessel Documentation center of the
U.S. Coast Guard ("NVDC") and that notation of this First Amendment be made on
the official records maintained by NVDC. Furthermore, the Certificate of
Ownership with respect to the Vessel shall be supplemented and endorsed to
reflect the filing of the First Amendment.

                                     Page 4
<PAGE>   5

         SECTION 8. COUNTERPARTS. This First Amendment may be executed in any
number of counterparts, each of which, when so executed, shall be deemed to be
an original and such counterparts, added together, shall constitute and be one
and the same instrument.

                  [Remainder of Page Intentionally Left Blank]

                                     Page 5
<PAGE>   6

         THUS DONE AND SIGNED, on the day, month and year first written above,
in the presence of the undersigned competent witnesses, who hereunto sign their
names with Mortgagor after reading of the whole.

WITNESSES:                         MORTGAGOR:

                                   GREAT RIVER CRUISE LINE, L.L.C.

                                   BY:      THE DELTA QUEEN STEAMBOAT CO.,
                                            A MANAGING MEMBER

/ s / Shahem Zenni
------------------------------              BY:      / S / JORDAN B. ALLEN
                                               ---------------------------------
                                            NAME:  JORDAN B. ALLEN
                                            TITLE: EXECUTIVE VICE PRESIDENT
/ s / Pam Stringer
------------------------------     BY:      DQSB II, INC.,
                                            A MANAGING MEMBER

                                            BY:      / S / JORDAN B. ALLEN
                                               ---------------------------------
                                            NAME:  JORDAN B. ALLEN
                                            TITLE: EXECUTIVE VICE PRESIDENT

                                     Page 6
<PAGE>   7

         THUS DONE AND SIGNED on the day, month and year first written above, in
the presence of the undersigned competent witnesses, who hereunto sign their
names with Mortgagee after reading of the whole.

WITNESSES:                                  MORTGAGEE:

                                            THE CHASE MANHATTAN BANK,
                                            AS TRUSTEE AND AGENT

/ s / Alexander Schneider                   / S / JONATHAN E. TWICHELL
------------------------------              ------------------------------------
                                            BY:      JONATHAN E. TWICHELL
/ s / Mary C. Lum                           TITLE:   VICE PRESIDENT
------------------------------

                                     Page 7
<PAGE>   8

                                 ACKNOWLEDGMENT

STATE OF ILLINOIS

COUNTY OF COOK

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                                Jordan B. Allen,

the duly authorized Executive Vice President and representative of The Delta
Queen Steamboat Co. and DQSB II, Inc., which said corporations are the sole
managing members of Great River Cruise Line, L.L.C. ("Great River"), who
declared under oath that he is the duly authorized representative of Great River
and its aforesaid managing members, and that he signed the foregoing instrument
with full authorization under the articles of organization of Great River and
the board of directors of each of the managing members, and that the foregoing
Amendment to Preferred Ship Mortgage is the free and voluntary act and deed of
Great River and its managing members, as well as said appearer in his capacity
as the representative of Great River, for the uses, purposes and covenants
therein expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 13th day of September, 2000.

/ s / Barbara A. Shafer
---------------------------------------
NOTARY PUBLIC
My Commission Expires: 11/3/01

                                     Page 8
<PAGE>   9

                                 ACKNOWLEDGMENT

STATE OF ILLINOIS

COUNTY OF COOK

         BEFORE ME, the undersigned Notary Public, personally came and appeared:

                              Jonathan E. Twichell

the duly authorized Vice President and representative of The Chase Manhattan
Bank, who declared that he/she is the duly authorized representative of The
Chase Manhattan Bank and that he/she signed the above instrument on the
authorization of such corporation's board of directors and that the same is the
free and voluntary act and deed of said corporation, and of himself/herself in
his/her capacity as representative thereof, for the uses and purposes therein
expressed.

SWORN TO AND SUBSCRIBED BEFORE ME
on the 12th day of September, 2000.

/ s / Deborah K. Welles
----------------------------------------
NOTARY PUBLIC
My Commission Expires: 3/10/02

                                     Page 9

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