Rainy Yakushima. Where shall we go?

During our stay in Yakushima, a large typhoon approaches. All flights and ships are canceled.
Are we going to leisurely pass our time at the inn today? Even though that’s fine, it is getting a little boring.
So we go to the Yakushima Environmental and Cultural Village Center, the tourist information center in Miyanoura (a town in Yakushima) to check, and it seems like there’s one walking course at Shiratani Unsuikyo Forest (about 30 minutes from Miyanoura where you can drive up a mountain) that is still partially open.

Links:
Shiratani Unsuikyo
https://www.japan-guide.com/e/e4654.html

Yakushima Environmental and Cultural Village Center
http://www.yakushima.or.jp/en/village.html