2 Days: To see Barcelona adequately, allow yourself at least 2-3 days, in addition to your time at Summer School. Many top sights are closed on Mondays, so Tuesday and Sunday can be crowded. The Picasso Museum, Sagrada Familia, and La Pedrera can have large lines, so you may want to get tickets in advance.

3 Days: Visit Ciutat Vella in one day (Ramblas, Barri Gotic/cathedral area, Picasso Museum/El Born), and on the second day, visit the Eixample and Gaudi sights (La Pedrera, Sagrada Familia, Park Güell)--consider a hop-on, hop-off bus tour for a sight-seeing overview, such as the Tourist Bus blue route linking most Gaudi sights. On the third day, visit Montjuïc and/or a side-trip to Montserrat. Stop at the Catalan Art Museum, Fundacio Joan Miro, and CaixaForum. Ride the scenic cable-car down from Montjuïc to the port, and then the rest of the day explore Barcelona, strolling the promenade, walking on the beach, and dinning in your favorite beach bar for dinner.

4 Days: Visit the markets (La Boqueria and Santa Caterina (closed on Sundays), and tour more tourist sights: Palau Güell's Modernista interior, the Barcelona history museum, Ferederic Mares Museum, Chocolate Museum, and more). Go on a walking or biking tour, or relax and rent a rowboat in Citadel Park.

5-7 Days: Plan extra day trips: to the monastery of Montserrat, the beach resort of Sitges, and the Salvador Dali sights at Figures and Cadaques.