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Can be booked as a guided tour at your hotel in Krabi. You will be taken there, and tour the cave in a self-paddled kayak with along with others. Lunch is included. The cave inaccessible except by water, and so you either rent you a kayak or hire a longtail boat for one hour for 400 baht. You will be fitted with a life jacket. The cave itself is very interesting. They found a couple of very large skulls lodged up in the roof (hence the cave name), and you walk through to look at it. Up on the ceiling are very old carvings, although they are hard to see. There is a walk through where you can get a good view of the cliffs. As the cave is open to the air, the stalactites and stalagmites have deteriorated.