One day
Start in the Praza do Obradoiro before the crowds, visit the cathedral and the Pórtico da Gloria, and circle the surrounding squares (Praterías, Quintana). Graze a market-and-tapas lunch of octopus and empanada at the Mercado de Abastos, wander the arcaded rúas and the university colleges in the afternoon, then walk to the Alameda for the sunset view of the spires and a final Galician dinner in the old town.