Lake Shikotsu is a caldera lake in Shikotsu-Toya National Park that was formed around 44,000 years ago. While it’s known for being “Japan’s northernmost unfrozen lake,” and when the surface does freeze, it provides a rare and unique opportunity to walk across the glistening ice. Try climbing on and breaking the icy surface, jumping in the water, or even burying yourself in snow. Your drysuit will keep you dry and warm, and it also floats, so even non-swimmers can enjoy this exciting guided tour. Make an opening in the ice and try it out for yourself!