1 Day trip plan

 First what you have to think about:

- Check in is in most of Ryokan Hotels 3PM and check out 10AM
- Pick up and Drop off at Yudanaka station is ONLY around the Chek in and Check out time
- Snow Monkey park is open until 4PM during Winter time

 
1st. Day
Check in is 3PM in most of Ryokans
Monkey park are closing 4PM during Winter time.
You should go to see monkeys before check in or next day. In some hotels you can leave your bags at Reception before check in. (you have to let them know in advance and in this case, they will not pick you up at Yudanaka station)
After check in and before dinner I advice to enjoy 100% hot spring bathing culture, as all Ryokans in Yudanaka-Shibu Onsen have hot spring baths. Also on the streets are Public hot baths which you can try for free. This place is well known in Japan as Healing Spa Town for hundreds years.
 

2nd. Day
      Breakfast is usually around 8 – 8.30AM

Check out 10AM
After you enjoy hot springs go and have a look on the monkeys taking hot bath.

If you have many bags, ask to leave your bags at the Reception and pick them up later after visiting Snow Monkey park.

- Take bus to the Kanbayashi stop and then walk 30min to the Monkey park
   or you can walk from hotel – it takes around 40-50min.(2,5km) from Shibu Onsen. (its   
   very nice walk trough forest)

After your camera will be full of great pictures from Monkey park and Yudanaka Shibu Onsen, you can go for next travel from Yudanaka station.

I advice to stop in Zenko-ji temple in Nagano city - its one of the oldest and biggest
wooden buildings in whole Japan! Zenko-ji is in nice garden together with many temples and one nice pagoda. Before the entrance gate is long street full of old japanese houses, trees and souvenier sops...This place is one of my favorite places in Japan
and after Snow Monkeys its the atraction nr. 1 in Nagano prefecture.