South Mountain Park is a great place to take visitors who have never been in the valley before - the views are running stunning. Most of the tails are okay at best - especially towards the trailheads. Close to the trailheads, there's not a lot in the wy of views or wildlife, and there tend to be a lot of people. If you travel in far, however, there's a lot more activity - endangered species, petroglyphs, old mining housing, even some rock-climbing.