Barca was a great stag I went on as well.
Just make sure you don't get lost on the way out of the club and find yourself wandering down by the docks at 5am...
only 2 of our number got mugged/pick pocketed in 5 days, not a bad result by all accounts. Pick pocketing is like the national pasttime over there.
by the end of 5 days i was so pissed off with muggers, dealers and blaggers - that was the only big downside - i think you can avoid it mostly by not going to certain places but we went to all those places.