This  is a difficult but very scenic 4WD trail, though parts of it a lot of mountain bike traffic now. However you can still drive part of the trail (as I did) in a stock vehicle to get good views of Determination Towers, two huge monoliths. Or park up and hike. IIt's a 7.7 mile loop.

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To get there drive north out of Moab on highway 191 for about 15 miles. Then turn left onto a dirt road just past mile marker 141.