The entire park is open to free dry camping wherever you want, making it a unique California State Park. (See the website for the rules.) ABDSP is a giant place with scores of State Park campgrounds sometimes hours apart. Yaqui wells, Bow Willow, Mountain Palm Springs, Blair Valley... again see the website for details. Some of the private campgrounds like Stage Coach Trails and Butterfield have everything, store, hookups, horse accomodations, pools. Auga Caliente (special, hot springs) and Vallecito are San Diego county parks. There is just about every kind of camping you can imagine. Palm Canyon in Borrego Springs is a nice starter, because the VC can help you understand the rest of the park, and the town is very nice, good eats, etc. That or Stage Coach Trails (private, in Shelter Valley) are probably best for ABDSP greenhorns. Palm Canyon Hotel and RV Park (not to be confused with nearby Palm Canyon Campground) in Borrego Springs is sort of the luxury RV place. Hope it helps!
Haven't been there. I live near the park.
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