Hi!
I've just returned home after a week in Galicia and I recommend you A Lanzada beach, it's near a town called O Grove. Other northern coast beaches that's worth a visit are Oyambre (Comillas, Cantabria) and Barro (Llanes, Asturias).
Edu
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Despierta ya, que el sol asoma y hay que disfrutar, cualquier motivo es bueno para sonreir