We were on an ATV tour, and asked the guides to make the side trip to the Boca el Diablo after reading all the reviews. There are stunning views to be had, and there were creepy sounds coming from the mouth, but there was no water shooting out. The guide described what usually happened when it was blowing, but we were very disappointed to find we should have checked the ocean conditions first. If we go back, I will definitely try to see it again, but with some planning.
Note to parents: there is nothing keeping you from going right up to the hole, and I almost fell in, because you can't see it until you are right on top of it. Watch where you step.
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