Our group of 6 boys and 2 adults signed up for the Mammoth Cave Expedition. I wimped out and took the regular tour. The boys spent about 45 minutes getting changed into their coveralls and knee pads and getting briefed on what to expect. The boys were 11 and 12 years old. They LOVED their tour and had no problems with any of the crawling and squirming through openings. They didn't get really dirty and wet until the very end of the tour when it was time to come get changed anyway.
A great thing about the Mammoth Cave Expedition is that there is always another easier way into each room if you start to get claustrophobic or look at an opening and your mind just says, "no way."
The Cavern is large with lots of different rooms and my tour guide did a great job of pointing out the interesting features in each room and telling the history behind the cavern. There's even a room with a feature called the bridalveil where they hold weddings once in a while.
I've been to Mammoth Cave in Kentucky and Carlsbad Caverns in New Mexico. Nothing compares to Carlsbad Caverns and this cave isn't as enormous as Mammoth but it's very interesting in it's own way and I would recommend it for a visit if you like caves.
The store is worth a visit too. I was very impressed with its selection of books on the outdoors. They offer gold panning in the summer and geodes you can crack yourself.
If you're with a group, California Cavern offers a nice campsite on a grassy field near a seasonal stream with picnic benches and BBQs.
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