3 Days in Barcelona
I second Pinotxos in La Boqueria, you have to have cava for breakfast, we had xipirones (baby squid) with white beans, omlette of tiny fish and shrimp, and a stew with lamb and potatoes...
Here were our other best meals in BCN:
CAL PEP, placa de les olles 8, Barcelona (walk straight down C/Montcada from Picasso Museum, Barri Gotic). Get there at 1:30 to get a seat. FANTASTIC fried sardines; cigarillas/escamarlans (ocean crayfish); xipirones (baby squid) with garbanzos; small clams with diced ham; solomillo (pieces of steak) with potatoes; always get pimientos de padron in Spain; we had beer with this meal but next time I would drink white wine, about 90 euros for 2.
If in the new part of town, try PACO MERALGO ALTA TABERNA, Muntaner 171 (a block or two south of Diagonal), Barcelona. Similar counter/tapas style, about 120 euros for two: bottle white wine, pajaritos (small green onions, fried); pimientos de padron; large cigarillas and clams; Galician oysters (just one each, they are 3.45 euros, but worth splurging for more, they are unlike our oysters, so briny and delicious); seafood croqueta; tuna steak; solomillo x2 (it was so good we ordered a second helping, with garlic and then with peppercorns); a couple glasses each Rioja tinto when we got to the steak; crema catalan (similar to creme brulee) and a delicious creamy bowl of soft sheep cheese with honey for dessert, coffee.
I third Cinc Sentits, Comerc 24, Cal Pep and La Boqueria.
I would do a late lunch at Cinc Sentits, late dinner at Comerc 24 to keep the theme of the day consistent.
Next day, La Boqueria and eat breakfast at Bar Pinotxo and then lunch on Havalles (razor clams in oil, garlic and lemon) at Kiosko Universal. Dinner time, hit Cal Pep and El Xampanyet, and then stumble from bar to bar to bar to taxi to bed.
Man, I miss it...
Referring to the previous post, I hope you don't have a reservation at El Bulli in Girona. The restaurant is in Roses. But the excellent El Celler de Can Roca is in Girona.
I recently posted a few dining options in Barcelona. See link below. Also search down for "Sauc or Alkimia".
I'm assuming that you didn't make reservations at El Bulli in Girona (and it's much, much too late to do it now), so here are some ideas for you:
Cal Pep (or its neighbour, Passadis del Pep)
Els Quatre Gats (more for the history than the food)
I don't know if they do the paella cooking in Plaça Sant Jaume (near the offices of the Ajuntament de Catalunya) in July but it's worth checking out.
Of course, you need to wander La Boqueria (er, the Mercat Sant-Josep)... it and Mikel Etxea are the only reasonable things on the lower Ramblas. If you eat at La Boqueria, go for one of the stands towards the back.