This is desert highlands and a beautiful part of the Sonoran Desert. (not much left with all the development) There are some jeep trails here and this area is also used by ATV and dirt bikes. Most of them stay off the singletrack.
From the parking area I head northeast and follow the powerlines along a jeep trail for a mile or so. It's a good warm up before you hit the singletrack. You'll see singletrack trails branching off of this jeep trail on the right that head out to several rock outcroppings in the distance. As you head toward these you will cross other trails. It's hard to get lost because you can always follow the powerlines or look at the many landmarks. Some trails are numbered.
It's a great ride because as you ride north you are gradually gaining elevation on a trail that has a lot of short ups and downs through boulders. It takes some skill to be able to get good speed going down to clear the uphill part. Lots of shifting and braking. The ride back is downhill and like a rollercoaster! Let it rip!