Welcome to the forum, Nancy, from Arizona neighbors! If you are looking for CA campgrounds and like the San Diego area, we can highly recommend the San Diego County Park system. Here's a link for more info: San Diego County Parks camping park information
We spent a week in the cool breezey weather of San Diego in 3 different county parks in May...Lake Jennings, Dos Picos and William Heise...amenities range from electric & water to full hookups (or dry if you want). And
you can make reservations on line! We plan to go back and explore more of their parks and perhaps revisit these...None of the parks is that far from downtown San Diego or the Pacific, and they are great places to stay relatively inexpensively ($20/night or less depending on hookups) in the area and "do" San Diego.
You don't say what size or type of AS you might be looking for. My advice is to think about how you plan to use it, where you will store it, how much $$ you want to put into it, do you want a newer AS or an older or vintage AS, are you interested in restoring it, what you want to tow with (if it's a travel trailer as opposed to a motor home)...and what you LIKE...all of these will play into what you finally decide to do. Go to an AS dealer and look at their inventory (new and previously owned) and ask as many questions there (and here) as you can...a good dealership will help you narrow the field...and you will find a myriad of helpful topics here and even more helpful members... Best of luck ...and Happy Trails! TB