The Koyodai Observatory is located on the top of Koyodai Resthouse. A 360-degree panoramic view from the observatory on a clear day is breathtakingly specutacular.
https://www.narusawa-kanko.jp/koyodai.html; https://www.narusawa-kanko.jp/pdf/koyodai_trekking_english.pdf
Mount Fuji, Aokigahara Jukai (Sea of trees or Woodland), Lake Motosu, and Lake Sai, Narusawa-village, Yamanashi, 11/17/2025
For the entire Tōkai Nature Trail, please visit the site:
https://en.wikipedia.org/wiki/T%C5%8Dkai_Nature_Trail.