Camelback Mountain is Phoenix's most popular hike....Piestewa Peak is Phoenix's best. Less crowded, less dangerous, and more rewarding at the top this is a trail I would do again in a heartbeat. The beginning can feel a lot like a giant stairmaster but toward the summit the trail gets really cool. Found a really good description of the trail here if you're looking for more info http://www.fuistetravels.com/mountains/camelbackmountain