You may want to go see the Dodgers or the Galaxy. I dunno if you're a sports fan.
Beware of the public beaches in Venice and LA, they're dirty as hell and some gangs hang out there.
In San Diego there's the zoo. Also you'll be in proximity to Mexico and Tijuana in San Diego, so if hookers, drugs and donkey shows are your thing, that may interest you. Oh yeah, and really bad gangs that will do awful things to tourists in Mexico.
Stay out of East LA and don't feed the crazy people on Hollywood boulevard when you go see the walk of fame. (I like the walk of fame at the harbor in HK way better than the one in Hollywood)