We often stay at Idaho State Parks. Since we are Idaho residents, we purchase an annual pass with our licence plates that allow us free entrance for camping, but the overnight camping fee is still applicable. We've camped at Bruneau Dunes, Three Island Crossing, Ponderosa, Massacre Rocks, Farragut, Henry's Lake, Hells Gate, Castle Rocks, Smokey Mt CG, Lake Cascade, Priest Lake, and Winchester. We've never been volunteers, and like most things about the state park system. We have several favorites - Farragut, Castle Rocks, and Henry's Lake.