LA/San Diego! San Diego has an awesome zoo, and you could take the kids to Santa Monica and Venice Beach for the scenery and all the cool stuff you can buy there. Hollywood Blvd. is also fun. I didn't do any amusement park stuff while I was there; I'm not big on parks (or super-touristy things in general), either.

I've never been to Vancouver, but it would also be a great place to visit, I think. I'd like to go sometime.