Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Sebastian (52% of total searches to Atlantic Coast). The next most popular destinations are Bilbao (32%) and Vigo (8%). Searches for hotels in Santiago de Compostela (8%) are also popular.
KAYAK users have found double rooms in Atlantic Coast for as cheap as $29 (Bilbao) in the last 3 days. The average price is $259.