The olympic harbour is good (i think you can rent out a bike as well for pleasant long rides along the coast)
Hmm the already mentioned Ramblas (be weary of pickpockets)
The Gaudi apartments are a must... (especially the rooftop)
Oh and when you get to the Christopher Columbus statue (at the end of the ramblas) note that its supposed to be pointing west to the new world... but due to some communication error they placed him faceing the wrong direction!
Above all, enjoy yourself and do post back with some pics : )
Oops just read this perhaps a day too late, maybe u are able to read this from there, good luck!
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