Within legislative appropriations, the department shall make a survey and prepare a master plan for a state system of trails with campsites and necessary facilities that takes into account points of historical interest and scenic beauty. Revisions of the plan may be made from time to time. On those parts of the trail that are not public roads, the department may prohibit motor equipment. The department may provide, develop, and maintain a system of trails with campsites and necessary facilities for the use of the public, within the appropriations made for those purposes by the legislature.