Ahem, Reeperbahn in Hamburg is supposed to be quite nice. I know Sky doesn't like Berlin but living there and visiting from overseas must be polar opposite. There is the Luftwaffe museum at Gatow near Berlin.
Aside from that all my visits to Germany have been work and beer, but mostly on the NL border.
Have fun, keep us informed what you're up to and don't forget photos.
__________________
|