Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Yamagata (65% of total searches to Yamagata Prefecture). The next most popular destinations are Obanazawa (17%) and Tsuruoka (13%). Searches for hotels in Tendō (5%) are also popular.
KAYAK users have found double rooms in Yamagata Prefecture for as cheap as $29 (Kaminoyama) in the last 3 days. The average price is $125.