Personally I'll be the lone dissenter and say USF/IOA. My kids loved it. We went to the MVMCP back in 2000, and we were like ..is that it?
My kids had fun, but we don't need to do again.
However, for USF/IOA, we go multiple times a year. You may want to post this on the Universal/IOA board for some new ideas or suggestions. If the 10 year old is tall enough, they can go on Hulk. Spiderman is worth the price of admission alone! Men in Black, Terminator II, Shrek and Jimmy Neutron is great as well.