Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Matsumoto (45% of total searches to Nagano Prefecture). The next most popular destinations are Nagano (22%) and Hakuba (21%). Searches for hotels in Yamanouchi (12%) are also popular.
KAYAK users have found double rooms in Nagano Prefecture for as cheap as £20 (Matsumoto) in the last 3 days. The average price is £152.