During the summer there is a small craft market along the seafront selling a wide range of locally made items. It's well worth a look, especially for special souvenirs to take home.
The local council are currently promoting it on their website. Here's a video they have produced. Just click the link.
And every Sunday you can find a market at the bottom of the Rambla selling a wide range of goods too, from books, bric-a-brac, vinyl discs to car parts, etc etc