Great location!
The Nature Center campsite is located at the trail head for the Root River State Bike Trail. Trail Head Park is a nice tent only campground with walk-in sites. A majority of the sites have picnic tables and fire pits. The Nature Center has clean bathrooms and free showers. They recommend donations for the use of the showers.
$20 per night camping fee. You can pay inside the Nature Center or at the slot between the restroom mirrors. The sites are first come, first serve. Local firewood is available near the restrooms as well; take what you need and leave the center a donation.
Trail Head Park has a 1 acre natural playground near the campsite. When I visited during the week, I only saw a small group of people using the playground. The playground has a zip line, tree house, small rock wall, and more. Inside the Nature Center, they have interactive and interesting displays. The highlight of this campground is the Root River State Bike Trail and the Owl Center in the town of Houston.
I'd give the campsite 4/5 review. The location, the bluffs, the bike trail, and center get 5/5 review.