ASan Francisco: Best places to stop and see driving from San Francisco to Los Angeles?
Hearst Castle is great, it's near Cambria which has lovely coastal views. Also if you time the season right you can see the hug elephant seals on the beach - def a worthwhile sight.
ALos Angeles: What is the best road to take traveling from LA to San Francisco
I've done all three several times, if you really don't care about time hw 1 is the way to go, however it will be over 8hrs without a doubt - gorgeous drive though.