You made it to the drainage pipe now muster up some courage and ride through it. You may have to walk a few feet once you leave the pipe. The trail climbs out of the wash on the left and when it crosses the wash again take the trail on the left up onto slickrock. Now follow the cairns and old painted dashes on the rock. Follow the trail towards Church Rocks along the rim then drop into the valley and head back to the trail you can make another loop or head back down to the wash and to the pipe that brought you there.
From I-15 get off at Highway 9(this goes to Hurricane and Zion National Park) Immediately after exiting I-15 head towards Hurricane and go right onto Coral Canyon road(if you pass the golf course turn around) and follow it down to the stop sign and hang a left until you see Heritage Park then find a place to park. Head north(toward I-15) on the road next to the parking lot for Heritage Park and look for a paved bike path on the right. Follow the bike path up to a water tank on top of the hill by the freeway. Head down a dirt road on the back side of the tank and then take an immediate right on a dirt track and look for a drainage pipe that goes under the freeway. The trail starts here.
http://www.singletracks.com/item.php?c=1&i=1628