So worth a visit to this cave near Hua Hin, Thailand. Taking a boat saves about 1.5km of walking. Might not sound far but when it is near vertical up and down it is worth it. Note the walk is classed as difficult and high fitness required, they are not kidding. But if you are a keen hiker then go for it. The remaining walk from the boat beach landing is hard enough and will push anyone’s fitness.

Some people in one photo to try to give some perspective on the size.