We just spent a vary quiet weekend at Potrero County Park. (San Diego County) I don't know just how far you are willing to travel for a weekend. I think at the most there was only 5 rigs there. And by noon on Sunday only 3 rigs. Last month we were at another SD County park (Guajome) near Oceanside CA. This park was full to the brim. But vary quiet. It not far from a large shopping center but vary quiet and nice.
www.sdparks.org