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Enjoy the hot springs.
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.