Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Sebastian (51% of total searches to Basque Coast). The next most popular destinations are Bilbao (33%) and Biarritz (15%). Searches for hotels in Bayonne (2%) are also popular.
KAYAK users have found double rooms in Basque Coast for as cheap as $28 (Bilbao) in the last 3 days. The average price is $339.