Islands of Adventure is a lot more fun than Universal Studios park. Harry Potter is the most popular and fun section by far! Expect crowds here but it is really great to see Hogwarts Castle and Hogsmeade. It was fun posing with the Dr. Seuss characters who were roaming around and seeing the Marvel Super Heroes like Spiderman and Wolverine jump onto motorcycles and ride off. Lots of teens here when I went. I can see why people say it is better suited to them than young kids. Might be too much spectacle and bombast for the little ones.