I agree with Alan. Home plate and the seat up on the wall are the best part.
That and the Legoland area.
My almost 6 yr old daughter loves Underwater World. We've been taking her there for her birthday every year since she turned 3. It's a bit pricey but look online for some discount coupons. Google it. Be prepared for the gift shop though. I get taken for a ride in there every year. $15 for a stuffed dolphin that's no bigger than a mouse?! I guess it's your birthday honey so ok.
Then we do lunch at the Rainforest Cafe. She likes the fish tanks.
Other than that, I avoid the MOA like the plague. It's worthless as a shopping mall because if you actually need to buy something, you're probably on the wrong end of the mall from where that store is. Never fails.
But, yes, you should definitely stop by and see it. Then you can say you saw it.
Bill