We went when they first opened on a Saturday and our group had 6 people including us. Our tour guide was knowledgeable, enthusiastic, and funny. The cavern is amazing to explore, and you can touch the rock formations! The tour ends with the waterfall which is just so cool to see and experience. Definitely worth the trip if you are looking for a unique and memorable activity. Wear a jacket and sneakers because it is damp and cool down there.