We spent 4th of July in the campground. We didn't get a full day in the Waterpark due to weather but had a great time nonetheless. The campground is quite new with new buildings which are very nice. There are many unfinished details, mainly the landscaping and roads. It got really muddy after a thunderstorm rolled through. The roads are a little rough, they will shake stuff loose if you go too fast.
My son is terrified of tornadoes and was very happy to see that they have a massive storm shelter. All in all, we had a great time. It is definitely worth the detour if you are RVing with kids on I90.