"Die Langste Theke die Welt". The world's largest bar. Over 400 bars and restaurants make up the Altstadt (old town) area of Duesseldorf. If you're anywhere near, you should try and plan a night here. Wednesday to Saturday nights are liveliest, but any night during the summer is normally pretty good.
Also home of Alt beer (old beer, although don't let this put you off).
Additionally, the Rhine Promenade, stretches from the Altstadt to the Hafen (Harbour) area and is crowded with open air bars, events, and people for most of the summer.

www.duesseldorf.de/thema/sights/altstadt/index.shtml (mostly in German, but it's easy enough to find, just ask someone to point you to the "altstadt"

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