Sonoran Preserve is located east of I-17 at the Jomax exit. It is a nice set of trails. If you are from somewhere other than Phoenix, I-17 heads north out of central Phoenix and goes to Flagstaff. Jomax is one of the last exits before you rise out of the Sonoran Desert. The trails were built in 2010, but since there are many other places to ride, I hadn't been there until today. I would have to say, they are probably the smoothest trails in the general area. Immediately upon leaving the parking lot, you encounter a climb that get the heart rate up higher than a geezer like me would appreciate. I'm one of those folks who like to gradually get the heart, lungs and legs in sync gradually, but darn near every trail in the area starts with an uphill that prevents easy synchronization. By the way, I forgot to turn on the GPS until I was a few hundred feet up the trail. After the big climb, the smooth trail surface made for some fast downhills. The full suspension folks probably don't notice that much difference, but as an old fat guy on an aluminum hardtail, I found nirvana.
The route I took today went from the southwest corner of the picture, up to the northeast to the second intersection, then around counter clockwise, then back down the entrance spur to the other intersection and around to meet the first loop, then back down to the parking lot. Good ride that took about an hour and a half. Definitely a do again.