Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Fujikawaguchiko (86% of total searches to Yamanashi Prefecture). The next most popular destinations are Fujiyoshida (9%) and Yamanashi (3%). Searches for hotels in Yamanakako (2%) are also popular.
KAYAK users have found double rooms in Yamanashi Prefecture for as cheap as $57 (Fujikawaguchiko) in the last 3 days. The average price is $313.