We thought the zip line this place was awesome until we saw the zip line at tramway adventures (at the base of Mt Rushmore). The zip line at Rushmore cave only lasts about 30 seconds. It is nice as a first experience and is good for a wider variety of people because it isn't a harness. The cave tour was interesting and the customer service was phenomenal. The panning for gems was actually a really fun little activity for the kids.