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An enormous event on the lake on August 15th. Get there early, mark your sitting spot the night before or the early morning of, eat stand food, drink beer, watch one of the top 5 fireworks shows in Japan. Come early to the fireworks and visit the Taiko Festival in neighboring Okaya a few days before.
諏訪湖間欠泉センター
A once an hour 10-min eruption. See the website for exact times.
諏訪高島城
This castle is quite nice but lacks English signs.
高島公園
The park is especially enjoyable in cherry blossom season.
八ヶ岳
霧ヶ峰
Look at flowers at this volcano.