Richard, you're driving the wrong direction.
Go SOUTH!
South of LA you have trestles, lowers, san clemente, del mar, encinitas, la jolla, and the fabulous 1000 mile stretch of surf mecca: Baja California, Mexico....
If you are still heading north there is Rincon (rarely breaks in the summer), Ventura, Santa Barbara, SLO, Big Sur, and of course Santa Cruz. (The last one being the best of all the surf towns).
The surf tends to be a lot smaller in the summer, but if you're lucky you might get to see a south swell or two, and that is when southern CA is at its best
Let me know if you want any details on any cities, and ill try to help you out!
Have fun, and maybe ill see you in San Diego
