<PAGE>

                                                                  EXHIBIT 10.23

                                   Silverwood

                                    Tremors

<PAGE>

                                    AGREEMENT

This Agreement is between:  RX Technology (SM)
                            P.O. Box 9112
                            Mandeville, LA 70470-9112
                            United States of America
                            Phone:(504) 727-9412

                  and

                            Silverwood
                            26225 North Hwy. 95
                            Athol, ID 83801
                            United States of America
                            Phone (208) 683-3400

This Agreement concerns the furnishing of a photosystem(s) by RX Technology(SM)
to "The Park" for a ride(s) known as:

                           Tremmors - "Roller Coaster"

1.    Responsibilities

      1.1   RX Techno1ogy(SM)

            A.    Provide a Theme Park photosystem(s) each comprising of:

                  1)    Complete photo-imaging system
                  2)    Video camera(s),
                  3)    Printers,
                  4)    Color display monitors,
                  5)    Electronic Point of Sale (POS) units,
                  6)    Cash registers,
                  7)    A suitable trigger source to detect the ride and
                  8)    Suitable flash/lighting units.

            B.    Provide video cables from the camera pole to the
                  photobuilding.

            C.    Provide backup equipment for unexpected equipment malfunction,
                  thereby avoiding prolonged delay in repair. Backup equipment
                  required to be determined by RX Technology(SM).

            D.    Properly and completely install the photosystem(s).

            E.    Provide technical support and maintenance to ensure proper
                  functioning of the photosystem, to the best of its ability.

            F.    Provide complete initial training of the staff, including
                  support after opening.

                                                            Initial: [ILLEGIBLE]


                                - Page 1 of 6 -
<PAGE>


            G.    Provide generic white folders for the photographs. Folders
                  must allow fast insertion of the photographs by the sales
                  staff.

            H.    Provide "The Park" with operational and troubleshooting
                  guides.

            I.    Supply the print media and ink cartridges for the video
                  printers. RX Technology(SM) to be the sole supplier of all
                  video printer paper.

            J.    Supply register paper rolls and ink cartridges for sales
                  register printers.

      1.2   "The Park"

            A.    Provide liability and general business insurance coverage for
                  the photobuildings and its contents.

            B.    Conduct all routine accounting procedures. These procedures
                  include any submission of taxes to state and local agencies
                  and the preparation of weekly sales and revenue figures.

            C.    Staff and operate all RX Technology(SM)" photosystem
                  operations.

            D.    Provide a suitable building, its themeing and signage. Provide
                  signage for photo sales.

            E.    Supply electrical wiring from the sales building to the camera
                  pole with the breaker switch located in the sales area.

            F.    Supply electrical wiring to the sales building and separate
                  circuit breakers as detailed in guidelines provided by RX
                  Technology(SM).

            G.    Provide an electrician or other park employee or contractor to
                  lay and pull cables, put up lights, etc. under instruction and
                  supervision of RX Technology(SM).

            H.    Provide and install a direct telephone line to the sales
                  building.

            I.    Purchase and install a suitable pole(s) - for the camera,
                  flash units and trigger sensor.

            J.    Supply trunking/conduit of at least 2 inches in internal
                  diameter and install it between the sales building and the
                  camera site, above or below the ground.

                                                            Initial: [ILLEGIBLE]


                                - Page 2 of 6 -

<PAGE>

2.    Terms and Conditions

      A.    The length of this Agreement is to be for a period of 3 years. RX
            Technology(SM) agrees to ensure that the photosystem(s) is updated,
            to the best of its ability. "The Park" agrees to ensure that the
            ride(s) is kept updated as appropriate.

      B.    In the event a ride is closed RX Technology(SM) and the Park may
            elect to reposition the system. Modification and changes required
            will be negotiated at the then current time and materials charges.

      C.    Both parties agree that neither shall be held liable for loss of
            income due to ride or system malfunction.

      D.    "The Park" will use its own banking method and security when
            depositing monies taken in payment of the photographs sold. RX
            Technology(SM) share of the revenue will be sent on a weekly basis
            to RX Technology(SM) at P.O. Box 1117, Fort Worth, TX 76101.

      E.    The selling price of the photographs shall be determined by mutual
            agreement between "The Park" and RX Technology(SM). It is agreed
            that the selling price can vary throughout the season.

      F.    Due to any unforeseen circumstances if ridership results in less
            than an average of 100 prints per day over a 2 week period, RX
            Technology(SM) retains the option to withdraw the photosystem.

      G.    Upon termination of this Agreement, RX Technology(SM) shall remove
            its property from park grounds.

      H.    Upon termination of the summer season RX Technology(SM) shall remove
            its property from park grounds and re-install and test at the
            beginning of the next season. We will perform routine maintenance on
            the equipment and update as required.

      I.    WHEREAS, KBK Financial, Inc. ("KBK"), a Delaware corporation,
            located at 301 Commerce Street, 2200 City Center II, Fort Worth,
            Texas 76102, has loaned funds to RX which is secured by, among other
            things, the Equipment (as defined in the Agreement) used by RX in
            the Shop (KBK's loan to RX is hereafter called the "Loan"); and

            WHEREAS, Silverwood and RX desire to amend the Agreement to provide
            KBK with certain rights in the Equipment in the event RX defaults on
            the Loan;

            NOW, THEREFORE, Silverwood and RX agree as follows:

            Notwithstanding anything to the contrary herein, upon the occurrence
            of an event of default under the documents (collectively, the "Loan
            Documents:") evidencing, governing and securing certain loan or
            loans made by KBK, Financial, Inc. ("KBK") to RX which is secured
            by, among other things, the Equipment owned and provided by RX (the
            "RX Equipment"), and KBK promptly notifies Silverwood of such
            default, at the expiration or

                                                            Initial: [ILLEGIBLE]


                                - Page 3 of 6 -

<PAGE>

            prior termination of the Agreement, KBK shall be entitled to
            promptly remove the RX Equipment from the Parks, except that
            Silverwood' Trademarks of Silverwood' Affiliates' Trademarks shall
            be removed from the RX Equipment and remain at the Park, and KBK
            shall quit and surrender the photobuildings in the Park in good
            condition, reasonable wear and tear expected. Unless Silverwood and
            KBK otherwise agree, if KBK fails to remove the RX Equipment from
            the Park within five (5) days after KBK receives written notice of
            the termination of this Agreement, then KBK shall be deemed to have
            abandoned such property and title to the same shall at that time
            vest in Silverwood. Any costs and expenses incurred by Silverwood in
            removing such abandoned property (including the reasonable value of
            the services rendered by the Park employees in connection therewith)
            shall be paid to Silverwood by KBK promptly following demand
            therefor.

            In the event RX defaults on the Loan Documents prior to the
            expiration or other termination of the Agreement, and KBK promptly
            notifies Silverwood of this fact, the Park shall thereafter place
            the share of Gross Revenue that is owed and owing to RX pursuant to
            Section 4 of the Agreement in an escrow fund pending either (I)
            final determination by KBK and RX as to what should be done with
            such funds, or (ii) receipt of an appropriate court order directing
            Silverwood on how to distribute RX's share of the Gross Revenue.

3.    General Statement

      A.    All revenue produced by the use of the photosystem(s) supplied by RX
            Technology(SM) are to be divided between RX Technology(SM) and "The
            Park" as agreed.

      B.    RX Technology(SM) agrees to license the use of its technology in
            "The Park" with no additional fees other than those described in
            this Agreement.

      C.    Installation dates of the photosystem equipment on the
            aforementioned rides is to be determined based upon availability of
            the sales building and completion of construction and electrical
            requirements. Target opening date is Spring 1999.

4.    Revenue Distribution

      The gross revenue calculation is to be based on the formula used in the
      following example:

                   THESE $ AMOUNTS ARE USED AS AN EXAMPLE ONLY

             Total Sale                                       $8.50
                                   -less 7% sales tax        -$ .55
                                                             ------
             Retail Sales Price                               $7.95
             55% Payment to "The Park"                       -$4.37
             RX Technology (RX pays for print media)          $3.58

                                                            Initial: [ILLEGIBLE]


                                - Page 4 of 6 -

<PAGE>

5.    Property Rights

      A.    RX Technology(SM) will retain ownership of those parts of the
            photosystem(s) that it supplies at all times throughout the duration
            of this Agreement and afterwards.

      B.    "The Park" will retain ownership of those parts of the
            photosystem(s) that it supplied, as detailed in this Agreement, at
            all times throughout the duration of this Agreement and afterwards.

6.    System Operation

      A.    "The Park" understands and agrees to leave the RX Technology(SM)
            photosystem equipment on at all times; 24-hours a day, 7 days a week
            -- including days when "The Park" is not open to the public.
            Temperature must remain constant at all times as fluctuations are
            extremely harmful to the photosystem. Staff will be instructed to
            leave the system in a "sleep" mode before leaving each day.

      B.    Proper care and handling of the RX Technology(SM) photosystem will
            prevent unnecessary malfunctions. It is imperative that our manuals
            and guides be closely adhered to at all times by all Park staff at
            all times.

7.    Acceptance

      A.    This Agreement, when signed by both parties as indicated herein,
            shall constitute the entire Agreement relating to the supply of a
            ride photosystem(s) and shall supersede all prior representations or
            contracts relating thereto and not incorporated in this Agreement.
            No modification or waiver of this Agreement shall be valid unless
            made in writing and signed by an authorized officer or
            representative of each party.

      B.    "The Park" has been made aware of this Agreement and grants the
            authority to engage in aforementioned business activities with RX
            Technology(SM). A representative of "The Park" shall acknowledge
            this Agreement by signing where indicated below.

8.    Notices

      All notices required or permitted to be given hereunder shall be in
      writing and personally delivered or sent by courier or registered or
      certified mail, postage prepaid, return receipt requested, addressed as
      listed below.

                                                            Initial: [ILLEGIBLE]


                                - Page 5 of 6 -

<PAGE>

9.    Force Majeure

      Neither party shall be liable to the other for delay or failure to comply
      with the provisions of this Agreement when such is caused by strikes,
      other labor difficulties, wars, fires, floods, explosions, earthquakes,
      government regulations, shortages in material, or any other reasonable
      cause beyond either party's control.

Signed for and on behalf of:           Signed for and on behalf of:


RX Technology(SM) Inc.                 Silverwood
P.O. Box 9112                          26225 North Highway 95
Mandeville, LA 70470-9112              Athol, ID 83801



Signed /s/ Donald Rex Gay              Signed /s/ David Norton
       --------------------------             ----------------------------------

Print Name Donald Rex Gay              Print Name David Norton
           ----------------------                 ------------------------------

Date 4-22-99                           Date 4/27/99
     ----------------------------           ------------------------------------

                                                            Initial: [ILLEGIBLE]


                                - Page 6 of 6 -