I recently took my sister and her two kids (3 and 5) and they had a blast!!!! They really loved the woody woodpecker rollercoaster. The adults had ridden the hulk, so the kids thought it was too cool that they could ride their own coaster. It was the longest day they had spent at a theme park, and they never got cranky. one trick, save Barney and other kid themed attrations for last, since that when they start getting tired. the 3 year old loved barney so much it actually made me enjoy it, and i hate barney. at ioa, make sure to go to the discovery center. the 5 year old said she was too scared to go see the real dinosaurs, but after seeing the discovery center and the baby dinosaur, she begged us to see the really big one!!