S.D.
One of our favorite cheap places to go is Campland on the Bay in San Diego. It is around $67 or so, a night. I know you said no camping - but you can rent a pop up trailer up there and they will have it all set up for you when you arrive. Each site is equipped with water, electricity, free internet and cable. The bathroom and showers are close and clean. They run activities for families throughout the day and have a private Bay (straight across from Sea World-you can watch the fireworks each night). We take the kids bikes and they to just cruise around. There is an awesome playground. It is only about 5 min from Sea World and the beach. If you cant tell, we love this place. It is the best vacation with kids because they can just run and play without much entertaining. My kids are ages 7,5,3,1.