Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Fujikawaguchiko (87% of total searches to Yamanashi Prefecture). The next most popular destinations are Fujiyoshida (10%) and Yamanakako (2%). Searches for hotels in Yamanashi (1%) are also popular.
KAYAK users have found double rooms in Yamanashi Prefecture for as cheap as $65 (Hokuto) in the last 3 days. The average price is $297.