This cave hasn't changed since I was a kid, which is exactly what I was hoping for. It seems like more of the cave was available to see a few decades ago, but the features I remembered so well were part of the tour.
The cave itself is fantastic but we were rushed through our tour. Although she was quite friendly and had interesting stories to tell during our visit, our guide kept urging us to keep moving whenever we tried to stop and get a good look at anything. From beginning to end was only about 25 minutes. There was nobody dedicated to staffing the museum, and our guide sat down next to her tip basket and said something like, "feel free to look around, I'll wait for you." As someone from the area, I was fascinated in the museum and could have spent hours in there reading everything and lost in imagining the past but "the guys" were anxious to move to other activities.
Our son (age 8) wanted to mine for gems, which was reasonably priced and he enjoyed it very much. The benches in the shade made it fun for the adults to watch him doing it. The gift shop had an amazing selection of on- and off-topic souvenirs, from a few cents to quite expensive, and amazingly friendly people working in there.
We got too hot and didn't do the mini golf but it looked like fun. I wish they would plant a few more trees or add more parking spots where there is shade. Parking in the sun when there is so much shade nearby is frustrating, never pleasant to end a visit to anywhere by getting into a car that feels like a furnace.