Not sure how close Anza Borrego St Pk is to you but there are lot's of off-roading opportunities there and nearby. X51 will be held at Anza on 3/20-21

At least a dozen or so members reside in SD so try the club board and review the calendar for some of the other runs such as the CC one in May in the SD area.
http://www.sccxterra.com/xcalendar.html

BTW another really nice and challenging place to wheel is Los Coyotes Indian Reservations (LCIR) near Warner Springs but there is an admission fee and some modifications like a lift/sliders go a long on most of those trails.

Hope to CYA on a Xcusrions soon, makes a perfect 1st outing, read the club board for more info on that.
http://www.sccxterra.com/board/forum.cfm?FID=1003

Brian