If you like art, go see the Getty. Reservations no longer required, costs only $5 for parking. Well worth the $5.
Check out Chinatown and Little Japan. Parking probably more than $5.
Take the tram tour at Universal Studios. Spend a day at Disneyland, easily the happiest place on earth.
Visit the Reagan Library in Simi Valley (to check out a former Air Force One 707, if nothing else).
Have fun.