Take the 5 on the way up and save 2 hours. Then you will be on the ocean side heading back to LA. Santa Cruz has the only true boardwalk (a walk made of boards) on the west coast. You might wanna check it out. Other then that all the usual suspects, Hearst Castle, Monterey Seaquarium (or whatever its called), etc. You can rent ATV's in Pismo and play in the dunes.
'06 Elise: Phantom Black, Touring, Starshield, Powder Coated Black Wheels,
'11 Evora S: Phantom black, '14 Jaguar F type silver