I've always liked Universal Studios but I haven't been in quite awhile so not sure what it's like now. The first time i went was when i was 5 and there really weren't a lot of rides back then. It was more like a studio tour with the tram ride and then there were presentations (shows?) about how they added sound effects to movies, etc. So I guess i've never looked at it as being all about the rides. I've always had fun there but I know some people have said they were diappointed with it.
Have you looked at Knott's Berry Farm? Again, some people have been disappointed but i've heard others say it's great if you're looking to do a lot of roller coasters. I haven't been there in a long time either so can't really comment on what it's like now.
Or there's Sea World down in San Diego. We went there a couple of years ago and had a great time. Not many rides there though.
I guess it depends on what your kids like. If they only want roller coasters then maybe knott's. If they are interested in movie stuff and also some rides, then US would be good. If they want to see whales, etc then go to SW.
Other ideas of non-theme park things would be catalina island, USS Midway (aircraft carrier) in San Diego, Queen Mary, Pasadena area (Gamble house, huntington library, etc), Hollywood stuff (although personally, i wouldn't recommend this since there's not much to see), Skiing/Snowboarding up at Big Bear, Aerial Tram ride in Palm Springs (probably snow up there too).
Hope that helps a little. Good luck planning and have fun on your trip!
