San Diego- my choice would be Chula Vista RV Resort. It's a 5 star park in my opinion located at the south end of San Diego bay. It's close to all of the San Diego area attractions.
Heading north your choices may be hard to get into.
San Clemente State Park is nice but only 2 hours north of San Diego.
I would try Rincon Parkway north of Ventura. It's a first come first get county campground right on the ocean. Best views for the money. Boondocking at it's best. If you arrive on Sunday thru Wednesday by 9-10AM you usually can get a spot.
Next choice north is in Buellton. Flying Flags RV Resort. It's a little inland but very nice full hookup park.
Or Jalama State Beach- great ocean camping. Windy... Great burgers at the snack shack. Road to get there is two lane narrow and curvy.
Morro Bay state park in San Luis Obispo area.
