I took my GX offroading at Otay Mountain here in San Diego and went over all sorts of terrain for 7+ hours. Too bad I didn't snap more pictures since I was too busy having fun, lol. 
Here are some pics!
Offroading @ Otay Mountain - Day 2! Aug. 2011 | Facebook

Here are some pics!
Offroading @ Otay Mountain - Day 2! Aug. 2011 | Facebook