Hey, Murrieta! We retired out of Temecula! We spent a couple of weeks at Betabel RV Park located just off of 101 between Salinas and Gilroy a year ago today! Very nice park. (We prefer the older section with trees, but none interfered with satellite reception.). Easy drive over to the coast. We drove through other parks closer to the coast, including many previously mentioned. Betabel is still our first choice. I believe Marina was the park where many of the RV sites also had another tent site located at the back of the RV site. Wrong! The RV park's entrance at Laguna Seca was lawsuit STEEP! We don't use KOA's but we had used the one at Moss Landing when it first opened and was not KOA. Off season, when the rates drop substantially, and when the park should be less used, it would be fine. When full, as reviewers have stated, you are pretty well packed in. We may well be back at Betabel the last week in Sept.
One of the coolest things we did was to drive the dinghy north to Felton and take the Roaring Camp train ride. Henry Cowell State Redwoods Park is right next to it - park there for both.