Moenkopi Trail, plus La Verkin Creek
Here are two very different riding options, just up the hill from La Verkin (north of Hurricane). One option is a fun and fast cruiser, 6.8 miles round trip, on fast ATV trail. The trail is fairly easy technically, with up-and-down riding, and only about 300 feet of total climbing round trip.
You'll see lovely views of mesas and colorful red badland slopes. The second option is for tougher and adventurous riders: you'll do part of the cruiser, then descend down to La Verkin Creek. Fighting uphill on sandy ATV-track, you'll cross the creek several times, then hike directly up the stream-bed through the gorge.
First, the Cruiser: From the trailhead, you head north. The ATV-track follows the break where the steeper soft red slopes of Moenkopi clay meet the harder pale dirt on top of the Kaibab Limestone. To navigate, just keep going north, and never take any track that will send you far away from those red slopes.
To lengthen the ride, consider riding up either of two washes you'll cross on the way. At mile 2.5, the main track turns abruptly left and drops steeply to the creek. Instead, fork right on fainter ATV track. When you reach cliff-edge with no more trail at mile 3.4, that's the turn-around.
Moenkopi Trail, Nevada 89161