Go to the 'plan a trip' then the 'find a campground' portion of this website to see the parks available. Then go to rvparkreviews.com and compare them. State parks that offer reservations fill up almost as soon as the sites can be reserved. Call and book private sites as soon as you can. Campland on the Bay is a favorite of my grandkids. Mission Bay RV Resort, less kid oriented, basically an asphalt parking lot with hook-ups, was already booked for one of the weeks in early July we wanted when we contacted them almost 2 months ago. Bernardo Shores in Imperial Beach still had space so we reserved it. Never been there, but the website and reviews look good. We stayed at Chula Vista RV Resort in December in a premium site. We liked it. Little further north, Oceanside has 2 nice private parks. Used to be able to camp near the launch ramp at Oceanside harbor first come first serve. Parks in both Escondido and Temecula (Pechanga is first rate) will require your fighting commuter traffic to get in & out of S.D. Having retired from Temecula, I can tell you that we did most of our local boating out of San Diego. Not much more than an hours drive if you wait to travel after the commuters are done.