Back way into Great Sand Dunes National Park. Camp in numbered designated sites only along route inside park or at Pinon Flats Campground. Picnic next to stream at base of giant sand dunes. Great fall color. Fee required entering or leaving park at main gate on south side. Unlicensed vehicles are not allowed inside the national park, but you can access the 100-mile-long Rainbow Multi-Use Trail via F.S. 412. MVUM for 2009 shows this trail open to 50″- wide vehicles all the way to Hermit Pass, Trail #98, and beyond.