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Also known as Jukai (樹海) or the "Sea of Trees", this forest is famous for its volcanic caverns and infamous as Japan's top suicide spot — in an average year, over 70 corpses are found.
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精進湖
Lake Shoji is a small, horseshoe-shaped lake, idyllic-looking and with pretty views of Fuji. Boating and fishing rental available.
本栖湖 Motosuko
Lake Motosu is the furthest out, also the deepest and clearest lake. Boating rental (paddleboat, rowboat) and a sightseeing boat available. You're not allowed to go out very far if you do rent a boat, though.
千円札の富士山
The image of Mt. Fuji on the back of the ¥1000 bill is taken here from the northeast shores of Lake Motosu.
紅葉トンネル, Momiji tonneru
In autumn, the beautiful orange and yellow tones of changing leaves ("momiji") are beautiful, and there is also a nice view on the lake and the mount Fuji.
三ツ峠山
The hiking time is 3 hours there and 3 hours back. The path is fairly well maintained.
河口湖 Kawaguchiko
The easiest to reach and the most touristic of the five; it's also the only one to have an island. There are several views on the Fujisan around the lake. You can see its reflections in the water from the north shores surrounded by cherry blossoms (spring) or lavender field (summer). You can also see the remains of the old lava flows from the Fuji to several places around the lake (in particular on the south shore)