Lake Klöntalersee is beloved by the inhabitants of Glarus, the city close to it. That's why on weekends, there can be many people up there. During the week, it's also in summer no problem. You can reach the lake by car or by bus, walk along it's northern shore and bath in it. While the upper part of the valley is interesting and more remote, we can recommend you to walk up to Schwammhöhe to enjoy the best view over the valley that also provides great waterfalls to photograph.