The real attraction here is the caverns themselves, plus the zip lining, river floating, and whatever other activities are on offer. But, the campground is not half bad! It's a large grassy area with plenty of trees (though no shrubbery or other privacy screens). There are no numbered campsites. Vehicles can be parked and tents pitched anywhere on the grass. My campsite, located in the far southwest corner, was one of a few with a fire pit, small paved picnic shelter, and picnic table. I was very happy to have the shelter, as there was a thunderstorm the morning of my visit.
There is a centrally-located camp store here. Their prices were reasonable when I visited. The bathrooms are located nearby, but these were quite run down, crowded, and dirty. I recommend seeking out the bathrooms at the visitor center. These seemed to be open 24/7 and were much, much nicer (and empty in the morning and evening).
Speaking of the visitor center, their food was surprisingly good. I had dinner and breakfast there, and was glad I did. They also had serviceable public WiFi that I used to catch up on Internet stuff while I waited for the rain to let up.