Pick yourself up the book called "Guide to Arizona Backroads & 4-Wheel Drive Trails" by Charles A. Wells. You can get it just about anywhere. I believe I got mine from Amazon. It's about $25 and well worth it. It shows about 75 trails, 86 maps, over 300 photos plus it has the GPS Waypoints. Each trail is identified by Easy, Moderate, or Difficult and explains why. There are many great off roads adventures in the Grand Canyon area (North Rim), around Sedona, and many around Prescott area. There is even a nice Ice Cave in the Flagstaff area.