T.F.
Hi, I absolutely think a 4 year old would love it. I have a four year old and she LOVES it! I have a 17 month old that loves it too. They've done an amazing job on the new structure. And if worse come to worse take your 4 year old to the Children's Park near the Merry go Round. If crowds are an issue wait a couple of weeks when school is back in session. May I also suggest Gilroy Gardens. It's a long drive but 4 year olds REALLY dig it. There are no crowds and no lines during the week. There's a water play area so bring a swimsuit and water shoes.