The boom in Japan about Hitoh (秘湯)= Secret Spa, Nyuto Onsen is perfect example of Hitoh which is a hot spring resort in the rural setting, surrounded by deep forest and mountains. The resort consists of 6 lodges and 1 state-owned inn which are all scattered around along the main road.
The nearest station for Nyuto Onsen is Tazawako on Akita Shinkansen Komachi (こまち) trains which provides hourly service from Tokyo to Tazawako via Sendai and Morioka. The journey takes roughly 3.5 hours from Tokyo, 2 hours from Sendai and 40 minutes from Morioka. Book your seat in advance, as seats on all Komachi trains are reserved. Japan Rail Pass is accepted.
Ugo-kotsu bus operates an overnight express highway bus service from Hamamatsucho (in Tokyo) and Yokohama Station to Tazawako Station. Single: ¥8,860 (¥510 extra from Yokohama), round-trip: ¥15,890 (¥1,020 extra for Yokohama).
Once you are at Tazawako Station, take a direct bus for Nyuto Onsen from Stop No.1, which is also operated by Ugo-kotsu bus (Red with white stripes). ¥800/single. The bus will pass through the only road in Nyuto and will call several stops before terminating at near Ganiba Spa, where the road ends. The journey takes 55 minutes via Tazawako. Buses usually connect Komachi trains from Tokyo.
Timetables for bus : http://lazuli.voyage/busstop/nyuto-onsen
Most lodges are close, and it is easy to walk between them. However, Tsurunoyu is off the main road, and the lodge has a minivan shuttle to the other lodges.
Main features of Nyuto Onsen are simply to enjoy plenty of mountain and forest scenery, mixing with other people (bear in your mind they come here on same purpose to enjoy this onsen, too!), taste traditional Japanese meals and appreciate their natural hot-springs constantly flow onto the surface.
In summer, thousands of flowers blossom and open up around you. While leaves on trees change to shiny golden colors in autumn which attracts many season admirers, on the other hand you may surprise the volume of snow falls in Winter.
If you are staying at one of lodges, each of them offer traditional dinner and breakfast with local dishes. Here are some restaurants which are handy for day trippers.