Time for Some Advice

Okay everyone, it is that time again that I call upon all of my lovely readers for your expert advice. I am in the beginning stages of planning my next trip and I would love to hear your do's and don'ts, the must see's and the can do without's.

So, here's my plan: Someone around February or March, I plan to travel to Germany and Poland. My route will be something like, landing in Munich and spending a few days (3-5) in the city and taking day trips to Nuremburg and the Bavarian Alps area, then taking the train to Krakow and visiting Auschwitz while I am there. After Krakow, I am looking to take the train to Warsaw and then finish my trip in Berlin.

I have already looked up numerous tours in various places and keep in mind, I'm a HUGE history buff, so any historical museums, sites, etc...that you think are worthy of my time, please offer them up!

Also, any restaurants, shops, hidden treasures, as well as travel tips in these areas, I would appreciate any and all advice!!!!