LA: Griffith Observatory (free, I think; the view is beautiful at night), The Getty Museum, hiking in Malibu, hangout at Santa Monica Beach. San Diego: Coronado, Balboa Park, hang out and see the seals in La Jolla, kayak out of La Jolla, take a surfing lesson if you've never done it (not super Mustachian, but a fun experience), and then grab burgers at Hodad's in Ocean Beach, hang out at Torrey Pines beach