Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Sebastian (48% of total searches to Bay of Biscay). The next most popular destinations are Bilbao (30%) and Biarritz (14%). Searches for hotels in La Rochelle (9%) are also popular.
KAYAK users have found double rooms in Bay of Biscay for as cheap as $24 (Bilbao) in the last 3 days. The average price is $308.