If you are in that area there is really not to many places to ride that are cool. I guess if I was to take mine out there I would be all the way up north by hyder and north of whitewing ranch. alot of washes and mountain terrain in that area with a few trails to hit.
My friends and I are planning a trip on some Jeep trail east of Yuma called the "Diablo Trail". Apparently, it's an established trail, and since one person in the group is going to be driving a Suburban, I assume its easily accessable.
That being said, considering the area, and the fact that its going to be an overnight/weekend trip, I hope this doesnt turn out to be the southwest version of "Deliverance".