About 16 km (10 miles) from Mae Hong Son, on the Pai road, this park has one of the region's strangest sights—a grotto with a dark, cisternlike pool overflowing with fat mountain carp. The pool is fed by a mountain stream that is also full of thrashing fish fighting to get into the cave. Why? Nobody knows. It's a secret that draws thousands of Thai visitors a year. Some see a mystical meaning in the strange sight. The cave is a pleasant 10-minute stroll from the park's headquarters.
70 Moo 1, Huay Pa, Mae Hong Son, 58000, Thailand