Oh you’re going to have so much fun! I lived in LA for a while so I’ll just warn you that what WAS cool to do there now has become washed away by a bunch of tourist-y stuff. I also will be regularly going out to Huntington for job training and schooling. But I’ll throw some things your way…
Los Angeles – Hollywood Walk of Fame, Sunset Strip, Planetarium, Griffith Park Hike, Dante’s Peak Hike, Hollywood Hills, Celebrity Home bus tours
Huntington Beach – Huntington Beach Pier, Johnny’s Tavern (A7X’s favorite hangout joint with awesome beer and pizza), Zombie Scavenger Game, Whale Watching tour in Anaheim, Surfing (surf lessons), Bolsa Chica Ecological Reserves, Pacific Coast Highway tour (lots of fun stuff that takes you along the coastline)
San Francisco – Vampire tour of Nob Hill, Haight- Ashbury (summer of love stuff) see the infamous Alcatraz prison.
Hope that helps a little!