Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Hakuba (36% of total searches to Nagano Prefecture). The next most popular destinations are Nagano (26%) and Karuizawa (20%). Searches for hotels in Matsumoto (18%) are also popular.
KAYAK users have found double rooms in Nagano Prefecture for as cheap as $25 (Ina) in the last 3 days. The average price is $180.