Entrance to Negishi Ryokan, one of many pilgrims' inns called "shukubo" where pilgrims would stay. During the Edo Period, Oyama had hundreds of pilgrims' inns, but now only about 40+ remain. 根岸旅館
Shukubo lodging rates start from ¥10,000 per person per night including dinner and breakfast. To search for a shukubo on Oyama, see http://ooyama-ryokan.com/english/index.html