Ditto on the Wells books. Use them for wheeling and ATVing. We've spent probably a total of six months in the Moad/Green River area over the last seven years, and we're still finding new places.
Don't miss the roads north and south of Green River, Utah. Some are just scenic county roads, some easy old mining road and washes. There are some really nice moderate side roads and some we won't touch. There aren't any guide books for Green River, but there are some good local free guides given away. If you stay at the KOA in Green River, Joe the owner, can give you about two weeks worth of easy to moderate fun. You won't get an adrenalin fix, but it is serious eye candy.
One of our favorites in Green River is to drive out to exit 139 on I70 go north on Buckhorn Draw Rd (county road), go to Swinging Bridge and then turn back on the San Rafael River Rd. ( high ground clearance but not necessarily 4wd), drive to the end of the road.
Our very favorite run in Moab is Chicken Corners. A don't miss is Hey Joe Canyon. It is rated as difficult, but the run down to the Colorado River is a piece of cake. It is only difficult at the end.