About 50 miles southwest of Green River, Goblin Valley is a basin of thousands of mushroom-shaped sandstone hoodoos — the Entrada formation eroded into goblin-sized lumps that look as if they were modelled rather than worn. There are no marked trails because there is no need; you wander the basin and the goblins are the landscape.
It is one of the few state parks in Utah where free-form exploration is encouraged. Children love it, photographers love the long shadows at sunrise and sunset, and the campground in the saddle above the valley is one of the best dark-sky sites in the state.