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                                                                    EXHIBIT 10.3

                      AMENDMENT TO AMERISTAR CASINOS, INC.
                         AMENDED AND RESTATED MANAGEMENT
                           STOCK OPTION INCENTIVE PLAN

        THIS AMENDMENT TO AMERISTAR CASINOS, INC. AMENDED AND RESTATED
MANAGEMENT STOCK OPTION INCENTIVE PLAN ("Amendment") is made as of this 5th day
of October, 2001.

        WHEREAS, the Board of Directors of Ameristar Casinos, Inc. (the
"Company") has determined that it is in the Company's best interests to amend
the Company's Amended and Restated Management Stock Option Incentive Plan (the
"Plan") so as to allow the Compensation Committee of the Board of Directors to
retroactively amend certain terms of options granted to participants in the
Plan.

        NOW, THEREFORE, the Plan is hereby amended as follows:

1.      Authority of Compensation Committee to Modify Awards.

        (a)    The existing paragraph 3(c) of the Plan is deleted, and the
following is inserted as the new paragraph 3(c):

               Subject to the provisions of the Plan, the Committee shall have
               the authority to construe and interpret the Plan, to define the
               terms used therein, to determine the time or times an Option may
               be exercised and the number of shares for which an Option may be
               exercised at any one time, to amend the terms of any award
               prospectively or retroactively (provided that no amendment shall
               impair the rights of the award holder without his or her
               consent), to prescribe, amend and rescind rules and regulations
               relating to the Plan, to approve and determine the duration of
               leaves of absence which may be granted to participants without
               constituting a termination of their employment for purposes of
               the Plan, and to make all other determinations necessary or
               advisable for the administration of the Plan. All determinations
               and interpretations made by the Committee shall be conclusive and
               binding on all Optionees and on their guardians, legal
               representatives and beneficiaries.

        (b)    The existing first sentence of paragraph 8(a) of the Plan is
deleted, and the following is inserted as the new first sentence of paragraph
8(a):

               An Option shall vest and become exercisable from time to time in
               installments or otherwise in accordance with such schedule and
               upon such other terms and conditions as the Committee shall in
               its discretion determine.

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        2.     General. Except as modified in this Amendment, the Plan remains
in full force and effect. The headings used in this Amendment are for
convenience purposes only and should not be read to limit or alter provisions of
this Amendment.

                                       2<PAGE>

                                                                   EXHIBIT 10.27

                      RESOLUTIONS OF THE BOARD OF DIRECTORS
                                       OF
                              BANCWEST CORPORATION

                               RE: EMPLOYEE PLANS

        WHEREAS, Section 2.03(c) of the Amended and Restated Agreement and Plan
of Merger dated as of July 19, 2001 (the "Agreement"), by and among BancWest
Corporation, a Delaware corporation (the "Company"), BNP Paribas, a societe
anonyme or limited liability banking corporation organized under the laws of the
Republic of France ("Parent") and Chauchat L.L.C., a Delaware limited liability
company, requires that as of the Effective Time (as defined in the Agreement),
the Company use its reasonable best efforts, in consultation with Parent, to
remove, or cause to be removed, from each and every plan, program, agreement, or
arrangement any right of any participant thereunder to invest in, or receive a
distribution in, Company Common Stock (as defined in the Agreement);

        NOW, THEREFORE, BE IT

        RESOLVED, that the BancWest Corporation Defined Contribution Plan (the
"DC Plan") is hereby amended as set forth in Exhibit I attached hereto.

        FURTHER RESOLVED, that the BancWest Corporation Future Plan (the "Future
Plan") is hereby amended as set forth in Exhibit II attached hereto;

        FURTHER RESOLVED, that the plan administrator of the DC Plan and the
Future Plan is hereby authorized, directed, and ordered to take such action as
she may deem necessary or proper in order to consummate the matters authorized
in the prior resolutions;

        FURTHER RESOLVED, that the BancWest Corporation Incentive Plan for Key
Executives is hereby amended as set forth in Exhibit III attached hereto;

        FURTHER RESOLVED, that effective as of the Effective Time, the following
plans shall be terminated and any outstanding options thereunder shall be
converted into cash in accordance with the Agreement:

              BancWest Corporation Stock Incentive Plan
              BancWest Corporation 1998 Stock Incentive Plan
              California Community Bancshares Corporation 1993 Stock Option Plan
              Continental Pacific Bank 1990 Amended Stock Option Plan
              Sierra Tahoe Bancorp 1996 Stock Option Plan
              Sierra Tahoe Bancorp 1988 Stock Option Plan
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        FURTHER RESOLVED, that the appropriate officers of the Company are
hereby authorized, directed, and ordered to take such action as they may deem
necessary or proper in order to consummate the matters authorized in, or
otherwise to accomplish the intent of, the foregoing resolutions.

                                       2
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                                    Exhibit I

                                AMENDMENT NO. 11
                             TO BANCWEST CORPORATION
                            DEFINED CONTRIBUTION PLAN

        In accordance with Section 11.1 of the BancWest Corporation Defined
Contribution Plan (the "Plan"), Section 8.4(e) of the Plan is hereby amended by
adding a new subsection (3) at the end thereof to read in its entirety as
follows:

               (3) Notwithstanding any other provision of this Plan, effective
        as of the closing of the Merger (as defined in the Amended and Restated
        Agreement and Plan of Merger dated as of July 19, 2001 by and among
        BancWest Corporation, a Delaware corporation, BNP Paribas, a societe
        anonyme or limited liability banking corporation organized under the
        laws of the Republic of France, and Chauchat L.L.C., a Delaware limited
        liability company), no Member shall be permitted to invest in the
        BancWest Corporation Stock Fund or receive a distribution in shares of
        BancWest Corporation common stock. As of such Effective Date, the shares
        of BancWest Corporation common stock in the BancWest Corporation Stock
        Fund shall be converted into cash in accordance with said Amended and
        Restated Agreement and Plan of Merger. The cash allocated in the
        BancWest Corporation Stock Fund to each Member shall be transferred to
        the account of the Member in the Stable Value Fund.

        To record the adoption of this amendment, BancWest Corporation has
executed this document this ____ day of September, 2001.

                                        BANCWEST CORPORATION

                                        By
                                        ---------------------------------------
                                        Its Plan Administrator

                                       3
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                                   Exhibit II

                                 AMENDMENT NO. 4
                             TO BANCWEST CORPORATION
                                   FUTURE PLAN

        In accordance with Section 11.1 of the BancWest Corporation Future Plan
(the "Plan"), Section 8.3(d) of the Plan is hereby amended by adding a new
subsection (4) at the end thereof to read in its entirety as follows:

               (4) Notwithstanding any other provision of this Plan, effective
        as of the closing of the Merger (as defined in the Amended and Restated
        Agreement and Plan of Merger dated as of July 19, 2001 by and among
        BancWest Corporation, a Delaware corporation, BNP Paribas, a societe
        anonyme or limited liability banking corporation organized under the
        laws of the Republic of France, and Chauchat L.L.C., a Delaware limited
        liability company), no Member shall be permitted to invest in the
        BancWest Corporation Stock Fund or receive a distribution in shares of
        BancWest Corporation common stock. As of such Effective Date, the shares
        of BancWest Corporation common stock in the BancWest Corporation Stock
        Fund shall be converted into cash in accordance with said Amended and
        Restated Agreement and Plan of Merger. The cash allocated in the
        BancWest Corporation Stock Fund to each Member shall be transferred to
        the account of the Member in the Stable Value Fund.

        To record the adoption of this amendment, BancWest Corporation has
executed this document this ____ day of September, 2001.

                                        BANCWEST CORPORATION

                                        By
                                        ---------------------------------------
                                        Its Plan Administrator

                                       4
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                                   Exhibit III

                                    AMENDMENT
                             TO BANCWEST CORPORATION
                        INCENTIVE PLAN FOR KEY EXECUTIVES

        In accordance with paragraph 10 of the BancWest Corporation Incentive
Plan for Key Executives (the "Plan"), the Plan is hereby amended by adding a new
Paragraph 12 at the end thereof to read in its entirety as follows:

        12.     Notwithstanding any other provision of this Plan, effective as
                of the closing of the Merger (as defined in the Amended and
                Restated Agreement and Plan of Merger dated as of July 19, 2001
                by and among BancWest Corporation, a Delaware corporation, BNP
                Paribas, a societe anonyme or limited liability banking
                corporation organized under the laws of the Republic of France,
                and Chauchat L.L.C., a Delaware limited liability company), no
                Member shall be permitted to receive awards in the form of
                BancWest Corporation common stock. As of such Effective Date,
                any such outstanding awards shall be converted into cash in
                accordance with said Amended and Restated Agreement and Plan of
                Merger.

        To record the adoption of this amendment, BancWest Corporation has
executed this document this ____ day of September, 2001.

                                        BANCWEST CORPORATION

                                        By
                                        ---------------------------------------
                                        Its Plan Administrator

                                       5

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