My list is ranked by trails and by the whole experience all together.
Location times there reason
1) Moab - 1 trip, trails, Coyote Canyon
2) Colorado - 1 scenery, trails, snow
3) Harlan - 5 trails, trip
4) Golden - 4 trails, good facility
5) AOP - 5 trails, very close to town
6) Windrock - 1 trails, good facility
7) Hale - 3 trails, poor facility
8) Morris - 5 trails, poor facility
9) Chocco - 4 trails, poor facility
10) Gulches - 7 trails, poor facility & parking lot