I love taking my son (who is 4) to the Splash Park. It's perfect for him to run around on a hot and humid day and even when it's busy, it's still fun for him. It's right next to the playground, so when he's done splashing around, he can dry off and play. We've been here several times and have never had an issue.
They also have a concession area with plenty of picnic tables. It's perfect to pack a lunch or get some snacks. A lot of fun for smaller children.