Piccadilly Street is one of the oldest streets in London, but it's also one of the most exciting. My very first night in London, my boyfriend dragged me out to this street and I was amazed at how full of happy crazy people it was. I spent half the night stepping over drunk passed out girls on the street, because the entire area is just crazy with nightclubs and people wandering around with their drinks. It's sort of loud and full of tourists but it's super-fun anyway. Also, the street ends at Piccadilly Circus, which is both a tube station and a meeting place for partiers.