支笏湖の秘湯「丸駒温泉」へ。湖と露天風呂とが一体となり、インフィニティ温泉のよう。 Went to "Marukoma Onsen", a secret hot spring in Lake Shikotsu. The lake and the open-air bath seemed connected, like an infinity hot spring. 丸駒温泉は日帰…