Get a dose of vitamin D at Platja dels Patins a Vela. Once you've worked on your tan, stick around and watch the sky transform with colors as the sun fades away.
You're spoiled for sightseeing choice when visiting Barcelona. Platja dels Patins a Vela is a good place to begin here, but there are plenty of other worthwhile attractions to discover. Sagrada Familia, La Rambla, and Plaça de Catalunya are close to the stretch of coastline and will round out your day nicely.