Get your fix of vitamin D at Cabedelo Beach. Once you've worked on your tan, stick around and watch the sky turn kaleidoscopic as the sun slowly disappears.
When you've finished exploring this Minho stretch of coastline, why not check out Foreigners and Borders Service, Sanctuary of Santa Luzia, and Church of Santa Marta de Portuzelo? They're near Cabedelo Beach and also popular with travelers.