La Rambla, also called Las Ramblas, is a tree lined street in the center of Barcelona that is the tourist center. Every time we had to walk down this street I was overwhelmed with the crowds and mildly unimpressed with the seemingly endless booths selling souvenirs. I was surprised to see a few jewish, kosher restaurants on this street, as well as that several of the souvenir booths sold seeds, of many varieties, including marijuia seeds and I was also surprised by the few jewelry stores there that sold some pretty jewelry under 10 euros.
While you can not come to Barcelona without taking a walk down Las Ramblas, I would not suggest planning to spend much time or to eat there – we found better and cheaper food elsewhere, especially in the Barri Gotic, which is not far from La Rambla.
La Boqueria is a giant market in the center of Barcelona, directly off La Rambla. It was overwhelming in size and how crowded it was, but I am glad we got to walk through. In some ways it reminded me of a larger, more hectic Reading Terminal; however, La Boqueria has been around since 1217!
This is the center of the old city of Barcelona and begins at Las Ramblas. Many of the buildings in this quarter date from Medieval times and while the streets here are busy, walking there is much calmer and enjoyable than along Las Ramblas.
This section of the city is definitely a place to take a morning or afternoon to explore, lazily walk around, hopefully with no plan and see what you find. Another area that I strongly recommend exploring is the area around the Picasso Musuem in Barcelona – La Ribera.