North of Moab, the Top Of The World Trail is a well marked route following a wide rough road that is open to ATV riding. It will take you up to the 7,000 foot viewpoint at Top of the World. You can use Rose Garden Hill and Onion Creek Trails to complete a loop.
To reach the ATV riding trailhead for Top Of The World Trail from Moab go north on Hwy 191. Turn right on Hwy 128 and go about 31 miles to the Dewey Bridge Boat Launch. You can park here and there is also camping available. Otherwise, keep driving towards the bridge and turn right on the Kokopelli Trail/Entrada Bluffs Rd just before you actually cross the bridge. Follow the gravel road 5.5 miles to teh start of the Top of the Worl trail and park. As you approach the trailhead intersection take the trail furthest to the right.