I had an enjoyable time touring Smoke Hole Caverns after deciding to pretend that their tour was secretly a comedy act for those "in the know".
They are, of course, one of just two caves worldwide where you can find cave coral, the other being in New Zealand. And don't forget that Smoke Hole is home to the world's longest ribbon stalactite. Also, second-tallest cave room in the country (just barely edged out by Mammoth Cave). The guide even showed us a "bat's nest" just inside the entrance!
With all that said, I'll point out that Smoke Hole Caverns is a beautiful
cave, and the tour is well worth admission even if you keep your fingers in your ears.