Sanxenxo (Castilian: Sangenjo) has been dubbed the 'Marbella of Galicia' and it does have a thing or two in common with some of Spain's Mediterranean resorts in the summer season: a busy leisure port, a long buzzing waterfront, and streets of mostly ugly 20th-century buildings packed with eateries and tourist accommodation. The tourism here, however, is almost exclusively Spanish. In winter it's dead.
Praia de Silgar is a fine, sandy and busy beach, stretching west from the shiny marina development in the middle of the seafront, which also contains a tourist office and a large car park. Further west, towards Portonovo, dune-backed Praia de Baltar is a bit quieter, as is Praia de Areas, 3km east.