If you only have a few days to visit Barcelona, we advise you to get on the tourist bus and discover the most interesting spots in the city in just one day. You can get on and off as much as you want with the same ticket. There are different routes, which are the following:
Red Route - From Plaça Catalunya to the Parc de la Ciutadella. We advise you get off at Plaça Espanya, Poble Espanyol, National Museum of Catalan Art, Montjuic cable car, Maritime Museum, Port Vell, Catalonia History Museum, Olympic Port, Zoo of Ciutadella Park, Gothic Quarter, Plaça Catalunya and La Pedrera.
Blue Route - From Plaça Catalunya to the MACBA. We recommend visiting Sagrada Familia (the most famous work of Gaudi) Park Güell, Tibidabo and Blue Tram-neighborhood Sarria, Camp Nou, Barrio de Gracia.
Green Route - From the Port Olimpic to Poblenou through the Forum for enjoying the best views of the city beaches.