It was a nice little break from the adrenaline activities we had been doing all week. An easy enough walk through a cave, lots of colored lights to make it pop. The hot springs inside made for a nice little dip, they sell swimwear at the entrance. I didn't like that there were about 5 different little shops you had to walk through while going through, and of just random stuff. Visit if you have time, but don't make it a priority.
Its not as much impressing as it said to be, and also expensive ticket i.e. about 120 yuan. Cave will take about 25-30 minutes. You can spend more time inside only when you are ready for mud bath and hot spring. There is also a Traditional performance including in the ticket price, which will give you a little feel that you have not wasted the money!