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This small but gorgeous museum on the northeast shore of Lake Kawaguchi was designed by Itchiku Kubota himself - one of the most famous kimono designers in Japan. Kubota's life work was reinventing the lost dyework technique of tsujigahana, a technique used heavily in Muromachi-period kimono and subsequently lost to time. The museum houses the results of the incredible series of tsujigahana kimono he designed and made, known as the "Symphony of Light"; each kimono is designed to show a picture flowing from the back of one kimono to the next. The museum also features two different tea shops, one Western style, one Japanese style, that make a nice break in the sightseeing day. The grounds of the museum are an artwork themselves, with a stylised entranceway in the shape of a lone-standing doorframe in the forest. To get there, take the Retro Bus and ask the driver to let you off at the Kubota museum. Walk several steps in the direction away from the lake, and you'll see signs. The museum is off to the left in the woods, just another minute's walk, surrounded by beautiful gardens.
青木ヶ原
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.
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.
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)
富士山パノラマロープウェイ Fujisan panorama rōpuwei
This short cable car climbs to a viewing platform next to mount Tenjō. There you can enjoy a nice view on the lake below and on the mount Fuji, and also have a tea and eat dango (rice flour dumpling).