San Diego, anything cool?

I'm going down to San Diego this spring for a well deserved vacation. I'll be going to the zoo, aquariums and museums, but I wanted to know if there was anything also there worth seeing. So fire suggestions into my brain. Please?
also can recommend any good restaurants or hotels? (I don't want to spend a whole lot of money, but I want to go someplace with better food then a fastfood joint)
also can recommend any good restaurants or hotels? (I don't want to spend a whole lot of money, but I want to go someplace with better food then a fastfood joint)