Lake Jasna is the easy postcard walk from Kranjska Gora: clear water, mountain reflections, a small beachy edge, and the road rising toward Vršič behind it. It is close enough to town for a casual stroll but scenic enough to justify lingering.
Go early or late if you want quiet. In summer the lakeside can be busy with swimmers, photographers, and families, but the setting is still lovely, especially when the peaks catch the light.