1. Yudanaka Onsen is a traditional hot spring resort located in the town of Yamanouchi, Nagano Prefecture, Japan. It is famous for its hot springs and its close proximity to the Jigokudani Monkey Park, where you can see wild snow monkeys bathing in hot springs.

One interesting fact about Yudanaka Onsen is that it has a history that dates back over 1,300 years. The hot springs were discovered by a Buddhist monk named Gyoki, who believed in the healing properties of the waters. Since then, Yudanaka Onsen has become a popular destination for people seeking relaxation and rejuvenation.

The town itself has a traditional and rustic atmosphere, with many traditional Japanese inns (ryokans) and small shops lining the streets. Visitors can enjoy strolling through the narrow lanes, exploring the local shops, and trying local delicacies.

2. The operating hours and contact information for specific hot springs and ryokans in Yudanaka Onsen may vary. It is recommended to check with the individual establishments for their working hours and contact information. Some ryokans and hot springs may have specific hours for day visitors and overnight guests.

3. Ticket information and transportation to Yudanaka Onsen can be obtained as follows:

- By Train: Yudanaka Station is the closest train station to Yudanaka Onsen. It is served by the Nagano Electric Railway, and there are direct trains from Nagano Station. The journey takes approximately 45 minutes. From Yudanaka Station, it is a short bus or taxi ride to the hot spring area.

- By Bus: There are also direct bus services from Nagano Station to Yudanaka Onsen. The journey takes approximately 1 hour.

- By Car: Yudanaka Onsen can be accessed by car via the Joshinetsu Expressway. The journey time from Tokyo is approximately 3-4 hours, depending on traffic conditions.

As for ticket information, most hot springs in Yudanaka Onsen charge an entrance fee for day visitors. The prices may vary depending on the establishment. It is recommended to check with the specific hot spring or ryokan for their ticket prices and any package deals they may offer.