Lake Saiko (西湖) is smaller and much less developed than neighboring Lake Kawaguchiko. The views of Mount Fuji from Lake Saiko's shores are blocked by other mountains, except at the lake's western end from where there are beautiful, full views of the volcano.
Lake Saiko is surrounded by wooded mountains and a few camp sites, and is a popular destination for those interested in camping, boating, fishing and other outdoor activities. A network of hiking trails covers the mountains and hills surrounding the lake, as well as Aokigahara Jukai, an expansive forest south of the lake, infamous as a suicide spot and for people getting lost.
Several caves, formed during past eruptions of Mount Fuji, can be found around Aokigahara Jukai in the vicinity of Lake Saiko. Three of them, the Ice Cave, Wind Cave and Bat Cave, have been developed to be easily accessible to tourists. The area is also known for its autumn colors which are usually at their best around the first half of November.
Retro buses along the Saiko Line connect Kawaguchiko Station to Lake Saiko, circle the lake in a clockwise direction and stop at Iyashi no Sato, at the trailhead to Koyodai and near the three caves.
Apart from the retro buses, there are a few regular buses that operate between Kawaguchiko Station and Lake Saiko. Buses bound for Shin-Fuji and Lake Motosuko stop at the Fuji Midorino Kyukamura bus stop near Yurari Onsen (20 minutes, 520 yen) as well as at the ice and wind caves a few minutes later. There is one bus every 1-2 hours. A second regular bus line connects Kawaguchiko Station with the northern shore of Lake Saiko, stopping near Iyashi no Sato and at the bat cave along the way.
How to get to and around the Fuji Five Lakes
Bus Network Map: