The Game and Parks State Park Improvement and Maintenance Fund is created. The fund shall consist of transfers made by the Legislature, money credited to the fund pursuant to section 60-3,254, and any gifts, grants, bequests, or donations to the fund. The money credited to the fund pursuant to section 60-3,254 shall be used only for the improvement and maintenance of state recreational trails as defined in section 37-338. Any other money in the fund shall be used to build, repair, renovate, rehabilitate, restore, modify, or improve any infrastructure in the state park system. Any money in the fund available for investment shall be invested by the state investment officer pursuant to the Nebraska Capital Expansion Act and the Nebraska State Funds Investment Act.