I love this place, This dry Cavern tour is worth the $20 admission fee, I have done this tour about 4 times, Although they have a ghost tour which was a lot of fun, they will give you a discounted price for a combo standard tour and Ghost tour, I also got a Good Sams discount during my stay.
The grounds have a general store, mini golf course that is pretty run down, trails, motel, Restaurant (the food is quiet good).They even have introduced a cavern dining experience. They also offer a night stay in the Cavern but it's very pricey. They had a very cool walk thru museum with all kids of things from the past mainly the 1960's bu I enjoyed it. The gift shop is pretty nice as well, there's lots of photo opportunities.
I did a tent site, and the campground was not packed so they told me I could camp wherever I wanted, we still did a primitive campsite, for $40 a night we got a site, fire ring and a Continental breakfast.The restrooms with showers were very nice and clean, the campground it self has seen better days, but again, the Cavern makes all the little issue's all worth it.