faultily I’m taking a 3-4 day trip up the California coast from LA to, maybe, Santa Cruz. Just interested in some cheap but fun things to do driving up. What cities to stop @ and what to see.

santa cruz
Big Sur/Carmel/Monterey
san luis osbisbo
pismo beach
Santa Barbara
Sonoma Coast
Mendocino

I know about Hearst castle, and the Acquarium at Monterey. But any other suggestions?