Obligatory Barcelona tourist tips (it's a subject I could bore for britain on):
* go to the food market on the Ramblas, go to Pinoxos Bar (it's a random market stall tapas place) and have the salt cod and lentil salad, it's actually fantastic
* if you only go to one modernista thing apart from the Sagrada Familia, make it the palau de musica and do the guided tour
* if you get the arse with modernistas go and see the Mies Van Der Rohe pavillion for some actual modernism
* get dinner at Can Mano in Barcelonetta, they do brilliant homestyle pan-fried fish with herbs type food for next no money in a backstreet formica clad canteen where you get hassled by old women selling lottery tickets as you eat. My sister used to live across the road and I haven't forgiven her for moving away yet...