I was there two weeks ago, it was great.
Had dinner at El Xalet de Montjuic, fantastic view and pretty good food. I would highly recommend it. And yes, the floor on the lower level does rotate, it's not just too much wine.
La Sagrada Familia is fantastic, but the interior is gutted as they are getting ready to finally finish it. The old cathedral is pretty impressive as well, an outstanding early Gothic period structure. The Picasso museum was awesome, don't miss it.
Great beaches, with lots of naked people on them. Unfortunately, most should have kept their clothes on.
La Rambla is a fun stroll, but we had a group of males there on a business trip and the hookers were out of control. I haven't been groped in public like that in a long time.
There are some great seafood places around the old harbor. Salamanca was wonderful, and not terribly pricey. One thing to take into account is that most restaurants don't open until about 9, so go for tapas early.
We had tapas somewhere just about every night. Lots of little plates of wonderful food. I can't remember any names of places, but there are a zillion of them there.
We stayed at Casa Fuster, in the Gracia area. Great hotel, the rooftop bar was outstanding. Lots of good restaurants around. The lounge has a jazz concert a couple of nights a week. We opted out, but talked to some people who went and they loved it. A great hotel.
Barca has a world class subway, so get full day passes and you can get around really easily.
The exchange rate is better, but the prices at most places will shock you. A group of three of us had tapas the first night and had an EUR160 bill (almost $200)in a couple of hours, without being extravagant. The hotel worked out to be about $300/night.
Suerte!