Day 1 — Gaudi's BarcelonaMorning: Sagrada Familia (book tower access tickets months ahead)Midday: Park Guell — the ticketed Monumental Zone and free surrounding parkAfternoon: Casa Batllo or Casa Mila (La Pedrera) on the Passeig de GraciaEvening: Gracia neighborhood for pintxos bars and local atmosphereDay 2 — Gothic Quarter & BeachMorning: Gothic Quarter labyrinth: Barcelona Cathedral, Placa Reial, El CallMidday: La Boqueria market for jamón, cheese, and fresh juice (avoid tourist traps)Afternoon: Barceloneta beach for swimming; walk the Olympic PortEvening: El Born neighborhood tapas crawl: patatas bravas, croquetas, pan con tomateDay 3 — Montjuic & PicassoMorning: Picasso Museum in El BornMidday: Cable car up to Montjuic Castle for harbor panoramasAfternoon: Fundacio Joan Miro and MNAC (Catalan National Art Museum)Evening: Poble Sec's Carrer de Blai for pintxos, Barceloneta for sunset cocktailsDay 4 — Gracia & Camp NouMorning: Gracia's Vila de Gracia neighborhood — quiet squares and bakeriesMidday: Camp Nou stadium tour (FC Barcelona museum)Afternoon: Tibidabo amusement park or Collserola viewsEvening: Eixample for a proper Catalan dinner: escalivada, fideuà, crema catalana