Other than the fact, it is actually pronounced "Bathelona," the next most important thing is Menu del Dia - Menu of the day!
This is a three course meal, served between 1pm-4pm. Almost every establishment does one and they cost between 10-15 euro per person, no more. There are three or four choices in each of the entree, main and dessert sections. It's all in Spanish, presumably so tourists don't go taking advantage of it. At first Karl and I would take everything on the first, second or third line... But after a few days we had learnt a few Spanish food words and were more educated in our guesses. The food was sensational.
I could live in Bathelona every summer; sleeping until 10am, having a croissant and coffee for breakfast, dawdling the streets until Menu del Dia kicks in, retiring for a siesta, sunset and cups of tea on the terrace, some light tapas for dinner then rewind. Bliss.