Uw tips:La Sagrada Familia, Parc Guell, local tapas bars
Barcelona is one of the most vibrant city in Europe. With the best tapas, all gaudy designs and perfect climate. Stay of the very touristic Ramblas and go into the small streets you'll see the real beauty of Barcelona. If you vist it's a must to stop at one of the local tapas bars to tasted the wonderfull tapas with the locals. And do not forget to visit the different Gaudi buildings. One of my favoutites is still Park Guell (the tour bus, which you can take on many places in the city, will take you there). And ofcourse La Sagrada Familia. A marvel of the 20th century!