When you visit Mammoth Cave National Park aside from the obvious attraction there are several other things to do. In addition there are programs put on by the staff which are advertised on their site.
You can plan a large group gathering at a nominal price. From the lodge ($$$), to the cabins ($$$) and campgrounds ($) there are several options. You can reserve the picnic shelters and meeting room at the Mammoth Picnic Shelter area at the rear of the main visitor center parking lot. Or just stop in and use the picnic tables and grills provided. This area is adjacent to one cabin area and two Trailhead’s.
I have seen deers grazing in this area as well as turkey. There have been some recent upgrades to the trails that traverse the picnic area. There are two loops , each with a pavilion in that area and plenty of picnic areas to use. One latrine and a dumpster/recycle area on the way out.
Almost anything you want to do above and below ground is in this area. Caving, hiking, camping,biking, horse back, canoe, zip line, four wheel, shooting and wine tasting to name a few (and golf….) bring your toys, make a reservation and enjoy :)
I put 1 star just so it'd be more obvious this is not really a campground (I guess The Dyrt pulls listings automatically from reservation websites?). I'm pretty sure we used this (or a similar nearby site) for a picnic and it was lovely. Just don't plan to stay the night!!