I grew camping out there and exploring all the differant canyons on camping weekends. We only had 2wd pickups so never got to do some of the real jeep trails, but a few fun rides that stand out are Oriflame/Rodriguez Canyon (up and over to banner from the S2) it is usually not too hard, but some spots can get rocky/rutted. it changes after every rain season and i haven't been there in a few years, and last time you had to have 31" and 4x4 to make it up the first climb.
Another fun area to explore is a bit farther down the S2, called Canyon Sin Nombre.
Ill try and find some info on those and post em.