If you want to know anything about the Zündapps, I would recommend the Museum Industriekultur where they have a special motorbike exhibition, see here for their website:

http://www.museen.nuernberg.de/engli...ekultur_e.html

Besides that, there is lots to see, first of all the medieval castle of the emporer of the Holy Roman Empire of the German Nation. It is more intersting to see from the outside, you have a nice view of the city from up there.

The old city itself is quite nice for a stroll, even though it was severely damaged during the war, lots has been rebuilt and they kept the old street layout as well as the proportions of the buildings, so even the new building blend in quite well. It used to be considered the most beautiful medieval city in Germany before the war... You can see Albrecht Dürers house there.

If you want to see art, the Germanic National Museum has lots to offer, even some Dürers.

Finally, a bit outside the centre, there is the "Reichsparteitagsgelände" (Nazi Party Rally Ground) where the Nazis had the annual rallies. They had a huge building project out there, but most of it was never finished due to the war. In what was supposed to be the congress hall one day, there is now an excellent documentation centre about the rallies and the Nazi party.

I would also recommend having a look at the official Nuremberg website, I think it is quite good: http://www.nuernberg.de/internet/portal_e/reiseziel/

Hope this helps for a start!