be VERY careful with pickpockets & bag thiefs, i have had four groups of friends go in the last year, only one trip was crime free. Other than that have a great time. The booze is really, really cheap, try buying a round for the whole bar and watch your evening go crazy! trust me :-)
Try and stick to the busier roads rather than the smaller roads. And yes watch your wallet. Have a fab time. We went a few years ago and when we got there we found out thsat it was christmas eve. It was great if not a little cold at -13 but hey it was fab.