Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Takamatsu (44% of total searches to Kagawa Prefecture). The next most popular destinations are Naoshima (41%) and Tonosho (12%). Searches for hotels in Shodoshima (2%) are also popular.
KAYAK users have found double rooms in Kagawa Prefecture for as cheap as £25 (Takamatsu) in the last 3 days. The average price is £72.