Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Yamagata (70% of total searches to Yamagata Prefecture). The next most popular destinations are Kahoku (14%) and Tendō (10%). Searches for hotels in Obanazawa (6%) are also popular.
KAYAK users have found double rooms in Yamagata Prefecture for as cheap as $38 (Tsuruoka) in the last 3 days. The average price is $206.