I always go to eat Basque tapas in "La Txapela" (in the Passeig de Gracia), delicious stuff.Heading for 5 days in the coming week as well...Curious from the locals any restos to recommend...I have a favorite already in La Flauta
Some new things that we visited during our 5-day stay last week:
Palau Guell (close to the Ramblas, yet another amazing building made by Gaudi)
Colonia Guell (a crypt made by Gaudi for the Guell family, was rather disappointing imho; about 30 min away from Barcelona by train)
Gaudi 4D experience (close to Park Guell, an interactive 4D movie that shows the origin of Gaudi's buildings, great stuff)
Montjuic open air cinema (they broadcasted Donnie Darko on a big screen next to the Montjuic Castell, but unfortunately we weren't able to get there in time)
I think I've visited about all scenic spots in Barcelona by now