They offer a 50 minute guided tour of a beautiful cave for adults and children. It goes 100 feet under the surface of the Earth. It's a long, challenging walk, including 265 stair steps. Most of the walking surfaces are rugged, uneven concrete. There are hand rails most of the way. But in some spots you walk on and over natural stone. In those spots you need decent balance, especially since you aren't supposed to touch most of the rock walls with your hands. There were also wet walking surfaces and handrails. In one area, the walkway was only was wide as one shoe (wider above the ankle obviously).
The cave is one large corridor, at least 60 feet tall, with amazing natural features such as stalactites, curtains, and columns. No bats. There is a large gift shop full of unique rocks, geodes, souvenir shirts, and decor, all with reasonable prices and a kind staff. Outdoor and indoor play areas, best for children 12 and under, simulate spelunking. We also stayed for the 9-hole mini golf course with lots of elevation changes and stairs. We didn't try the 'pan for gems' type activity.