Try Dillon Beach ( Far Northern Marin County)
Oh, it’s pretty much all out of my price range. But, if that were to change, I’m partial to Stinson Beach. Where I am, a half million buys a very nice 4,000 sf house with three car garage and pool. There, if you can find it, that might get an old 2 br 1 ba cottage on a tiny lot in dire need of repair.