Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Hakone (46% of total searches to Kanagawa Prefecture). The next most popular destinations are Yokohama (38%) and Fujisawa (8%). Searches for hotels in Kawasaki (8%) are also popular.
KAYAK users have found double rooms in Kanagawa Prefecture for as cheap as $34 (Fujisawa) in the last 3 days. The average price is $392.