Earth : Asia : East Asia : Japan : Chubu : Nagano (prefecture) : Yamanouchi
The tourist information center at Nagano station can give you a bus and local train timetable to get to the monkey park, as well as a brochure with a handy map for the walk from the bus stop to the park. English spoken.
Yamanouchi town's Yudanaka Station is 45 minutes from Nagano on the Nagano-Dentetsu rail line; Nagano in turn is 95 minutes from Tokyo on the Asama bullet train. The train from Nagano to Yamanouchi is ¥1210 one way; then you need to catch a bus or walk. Bus tickets can be bought either at the ticket window at the station exit (¥310) or on the bus itself. There are English language announcements made in the bus.
You can take a public bus to Shiga Kogen and get off at Kanbayashi Onsen, which is an easy 30-minute walk away and costs ¥1300 one way. Alternatively - a minibus to the monkey park runs seven times a day from Yamanouchi town and costs 1,500 yen round trip, including admission to the park. WINTER ONLY.
Walking back down to Yudanaka Station from the park takes about 1.5 hours (possibly a bit longer in the reverse direction up). The route first follows the off-limit road along the river through forests before entering the beautiful spa town Shibu Onsen after that Yudanaka Onsen. A little further along the way stands a tall statue of a Kannon Buddha.
Visit the hot springs of Shibu Onsen (渋温泉) and Yudanaka (湯田中).
If staying in Shibu Onsen, there are no convenience stores open all night like 7-11 or Family Mart. Buy snacks and drinks near the train station before heading out to Shibu Onsen to your hotel/ryokan