I agree with Sea World being a better bet, at least for financial reasons for us.

If we organize as a group it is cheaper too. I took a group of students there last year and the backstage tour we went on was great. I don't know if that would be an option, and I don't know if there is a minimum age either.

My DC are 3 and 8 and absolutely love Sea World (not to mention that their parents do too!)