So Cal-Last minute camping available?

We are looking for a place to go camping that we can actually get into with having a this a reality or not?

We are familiar with Jamala Beach but are looking for other similiar camping areas for last minute summer trips.

Any Southern/Central California suggestions?
So Cal-Last minute camping available?

We have had the same problem in So. Ca. with some parks taking reservations two years in advance and having 90% "seasonal" residents. There is a great five star KOA in Petaluma, just north of San Francisco, that has daily availability during the week. Near the coast, giant redwoods and wine country.