A 5- to 10-minute walk from Kawaguchi-ko Station, this is the most developed of the five lakes. It's ringed with weekend retreats and vacation lodges—many of them maintained by companies and universities for their employees. Excursion boats depart from a pier here on 30-minute tours of the lake. The promise, not always fulfilled, is to have two views of Mt. Fuji: one of the mountain itself and the other inverted in its reflection on the water.