Red Rock Canyon Open Space

This place is city owned, and has some really well built singletrack for hikers, bikers, and equestrians as well as a skills park for bikes, and lots of sport climbing routes for the rock climber types. They even have secluded hiking only trails and places to let your dog off the leash (although most people just do it everywhere in the park). This is a cool idea that seems to work quite well; a multi user park that actually accepts input from the community on what to do with their land.