San Diego. Has Legoland and Sea World for the kiddies and Gaslamp Quarter for some late night...stuff. Wouldn't really know, never ventured down there. The zoo & wild animal park are worth a visit (actually, it's two visits, they are seperate parks). Beaches rocks, and Torrey Pines are is nice. And there is a nice fix of malls, with Fashion Valley, UTC, and Mission Valley. All worth a visit if you never been to mall in your lifetime.
Also, if you've never been to Oscar's...go to one. It's a great resturant, their pizza and ribs rock, and their breadsticks make me drool...again, it's in Mall-land, aka Mission Valley.
Of corse, if you don't even go to SD, then none of this information will be of any use to you. Just go to Barnes and Nobles and pick up a book on LA, that's simple enough.