O Grove sits at the tip of a peninsula that juts into the Ría de Arousa, 15km west of Cambados. The town has little in the way of architecture or history, but it has an exceptional relationship with the sea: the surrounding waters produce some of the finest mussels, oysters, clams, and percebes in Spain, and the fish restaurants that line the main street exist specifically to cook them well. This is not a destination for sightseeing — it is a destination for lunch.
Every October, O Grove hosts the Festa do Marisco, a shellfish festival that draws large crowds from across Galicia and beyond. Outside festival season, the restaurants are quieter and the prices more manageable, and you can combine a meal with a walk along the waterfront or a visit to A Toxa Island, connected to O Grove by a short bridge. The drive from Cambados along the coast road passes through the salt marshes and mussel farming areas of the Salnés coast, which is worth doing slowly.