Snakes Mouth Waterfall isn't just majestic to gaze upon — it sounds amazing too. Find a nice spot to sit, shut your eyes and listen to the water tumbling down.
You'll be spoiled for sightseeing choice when staying in Yakushima. Snake's Mouth Waterfall is a good place to start here, but there are loads of other fine attractions to explore. Mount Miyanoura, Yakushima National Park, and Yakusugi Land are not far from the cascade of water and and will cap off your day nicely.