Don't go over the fence and enter the moss field.
Kokemusumori (苔むす森) is one of the main attraction in Yakushima Isaland. It is a deep forest covered with full of moss. The image of Princess Mononoke is coming from here. Kokemusumori is located in Shiratani Unsui Valley. It is one of the best scenic beauty in Japan.
Tourist Info.
There are parking and restroom.
You need trekking shoes, water and lunch box.
For beginners.
Takes 4 to 5 hours.
Access
0. at Miyanoura Port.
1. use a bus to Shiratani Unsui Valley (35 min.)
300 JPY
2 hr.
New Wave Samurai Movie. 
映画好き集まれ！ 
Don't go over the fence and enter the moss field.