Look for a nice spot to sit, shut your eyes and listen to the water lapping at the shore at Carneiro Beach. If you need a dose of vitamin sea, this is the place to get your fill.
You'll have no end of sightseeing choices when staying in Porto. Carneiro Beach is a good place to begin here, but there are many other worthy sights to appreciate. Sandeman Cellars, Porto Cathedral, and Casa da Musica are not far from the stretch of coastline and and will cap off your day nicely.