Hi guys!
well, I'm going to answer some of your questions...only the questions I can remember now xD.
Barcelona is a city with lots of important places to visit, like parc güell, casa batlló, sagrada família, etc.. it's also funny walking throug the ramblas, on the city's center, and you can also find lots of shops there.
About discotheques in barcelona, you can find discotheques of almost all the kinds of music.
And that's all I can remember...I hope I have helped you.

lots of kisses =)