Stopped by when I was playing in the Margaret River area. There are several caves here, we chose the larger mammoth cave. The inside of the cave is very cool, and there are staff members who will explain it. When we went there were few people, it was basically a private room. There is a stone in the hole with a special color and shape, like a red shawl.
There are actually several caves in this area. It will be cheaper if you buy a package, but we have limited time and can only visit one. The time to go to Mammoth Cave is relatively early, so there are basically no other people. The special thing in the cave is a red stone, like a shawl, which is very interesting.
Visited here a few times. Definitely worth going!