You can take the Tobu Bus from JR or Tobu Nikko Station, and get off at Chuzenji Onsen Treminal, for a total 40 min ride. Thereafter, the Kegon Falls are a short walk away.

Futami Okitama Shrine Rocks
You can get there by CAN bus. The rocks are a 15 minute walk from JR Futaminoura Station, which can