Purchase tickets and join the crowds at a game at Reale Arena. If there's nothing happening while you're there, you might like to check if the stadium offers a tour of the grounds.
This San Sebastián sporting facility is an interesting spot to start your day of sightseeing. There's loads to experience close by, including Concha Beach, Monte Igueldo, and Monte Urgull. Wander around at your leisure at Reale Arena before making tracks to these other fine sights.