there is a place called "the mounds" in genessee county,mt. morris,by flint, it is a county offroad park, quads dirtbikes and trucks welcome, it's like $8.00 a day, it is a big place, trails, lots of mud and a new rock course, definatly a place to check out, lots of good people, website called wegotmud.com lots of pics mostly of trucks but you can get an idea of what the place is, check it out.