During the Hakone hike you may encounter two venomous snakes, mamushi and tiger keelback. Mamushis are commonly seen venomous snakes in Japan and lurk mainly in shrubs or grassy area. Tiger keelbacks or yagakashis rarely attack human but occasional biting has been reported. Yamagakashis were brought to attention when they were found deadly for children because the venomous fangs fit right into children's wrist when the children try to catch the snake. Tiger Keelbacks are easy to distinguish because they have yellow hides. When bitten don't move much and asked for emergency help. When asked what happened just say, "Hebinikamareta", (I was bit by the snake).
Click on the photo and read the sign. Rocks definately were going the oppisite way on the way up and moved with me on the way down.