Enjoy the serene experience of open-air hot spring bath surrounded by the beautiful nature of Nikko and if you are lucky enough you may have a glimpse the wild deer wandering in the woods.
Besides the open-air onsen, Hoshi no Yado hotel in well-known for its Yuba cuisine, and they do offer the lunch + onsen package for the day trippers (~3740 yen). But if you decide to just experience the open-air onsen, the entry charge per person is 1000 yen