Any portion of any parcel of real property acquired for state park system purposes, which had been farmed or grazed, or otherwise used for agricultural purposes, within the 24 months immediately preceding acquisition, may be made available for lease for agricultural purposes by the department if the director makes written findings that use of the real property for agricultural purposes would be compatible with the ultimate use of the real property as a unit, or part of a unit, of the state park system and with the sound management and conservation of resources within the unit.