My 4-year-old son and I went on the Bluespring Caverns tour as part of the four-site Indiana Cave Trail. This one-hour(-ish) tour was almost entirely conducted on a shallow, flat-bottomed boat with just enough lighting to see around the boat. Our tour guide pointed out the more curiously-shaped formations (most of these formations get names), and he took care to ensure that we saw the cave-native wildlife like eyeless fish and eyeless crayfish.
We are rather serious "cave tourists", and this was our first boat tour. It was very enjoyable, as it shows a side of caves that you can't see when you are walking through the stalactites and stalagmites. Past the tour, there's a small gift shop in their visitor center and a nature trail hike for those so inclined.
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