Upper Coyote Wash features 10 miles of hiking trails near Oro Valley, AZ.
Coyote Wash is not really an official trail system but one I stumbled upon just riding around. There are lots of options. The best place to start is off of Rancho Vistoso Blvd. just north of the Safeway shopping center. Look for the "trail" sign hidden off the sidewalk on the right (east) side of the road--it is about 1/2 mile north of the Safeway. Get on this walking path (gravel) and follow it north until it turns east and goes downhill into a large wash. You'll know you are on the right trail if you come to a barbed wire fence with a green gate. Go through this, and when you come the Y intersection after another 1/4 or so, head north on the two-track.
http://www.tripleblaze.com/trail.php?c=3&i=2694