This tree-lined, pedestrian street is a thrilling promenade, and your kids will love the street performers, live music, vendors, and crowds of people soaking in the brilliance of Barcelona. From the early morning until late at night, La Rambla is constantly bustling with people from all over the world. The pavement below your feet has wavy designs that appear like ripples in water which is fitting, as crowds of people float down the promenade like a cascading stream.