Start at the East trailhead and take the singletrack trail from the west side of the lot. It will intersect a jeep road, from which you may ride other singletrack spurs until you get to the Dome trail. Take the Dome for a very challenging ride (climbing and exposure), or the inner "white" loop (which is only rated advanced). Both end at the west trailhead: you may loop back on a hilly 7.7 miles on Hwy 170 along the Rio Grande, or turn around at the Dome turn-off and ride the jeep road back. Take LOTS OF WATER, tubes and a GPS unit if you have one. The hostile terrain, heat and mountain lions make this a good ride to do with a friend. Start early in the day; even in April it can hit 100 in the early afternoon. Check at Desert Sports for full details, guides and rentals.