Balbec is Cabourg

Map showing Paris to Cabourg; click the + to zoom in.

Balbec is the fictional name of Cabourg, a town near the sea in the Basse-Normandie region of France. Proust spent the summers of 1907 and 1914 in the Grand Hôtel at Cabourg. Random walk site.
Gare de Dives-Cabourg, Dives-sur-Mer. From Gregory Deryckère 

Train station in Balbec-Plage (right);

Proust in Cabourg (photos and audio); 

The Grand Hotel still looks like a great place for les vacances  (below)