If you're up for the drive, Holiday World is a great way to spend a day. We'll usually spend the first half of the day in the water park area then the second half in the ammusement park. You could easily spend a whole day in either section if you wanted to, but I just like hitting the whole thing. It's a pretty drive down there, there's hotels and campgrounds near by. Lincoln State Park is 5 minutes down the road, it's a good place to spend the night.