Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Bordeaux (64% of total searches to French Atlantic Coast). The next most popular destinations are Biarritz (19%) and La Rochelle (12%). Searches for hotels in Nantes (5%) are also popular.
KAYAK users have found double rooms in French Atlantic Coast for as cheap as $42 (Saint-Jean-de-Monts) in the last 3 days. The average price is $245.