How long should I stay in Nuremburg Germany in December 2009 for Christkindlmarkt? I will also stay 7d in Muc.?

How much is there to see and do in Nuremburg germany? How many nights should I stay? I know Munich has alot more to do...trust me...I was there (Munich) in September 2006. I then plan to go to Switzerland (Zurich) and (Geneva)...I've never been to switzerland..