I took my daughter to UOR for her 4th birthday some years ago. All I can say is that she loved it. She was a tall-ish 4 year old, but she loved Flight of the Hippogriff, the Hogwarts Express, all the Seuss stuff, Shrek, Minions, Men in Black, ET, Woody Woodpecker, and Jurassic Park Flyers. She wasn't tall enough for Forbidden Journey, so we did rider swap and she was given a certificate to return and go to the front of the line when she was (I'm not sure that they still do this). She also really loved the big donut in Springfield. The dragon was a bit scary. I don't regret taking her.