This was a stunning surprise. An alpine forest park, securely protected, but well managed to be accessible by a couple of million visitors a year, and planning for more, with minimal damage. It’s enclosed in two mountain valleys whose streams cascade from lake to lake to meet just above the park entrance. Walkers are kept to boardwalks carefully built for an intimate natural experience, close to water and grasses, pines, birch, and much more, but enabling one of China's more litter-free environments. Ian will explain the chemistry of the lake colours.