Extra Day in Bavaria

Regensburg's old-town center is a UNESCO World Heritage site and only 1:20 from Munich by direct train. Use a Servus Ticket (€20 for one) to get there and back (sorry, I don't know of an English site for this ticket... buy it from a Munich ticket machine.)
More info: https://tourismus.regensburg.de/en/about-regensburg/sightseeing.html

We were in Munich in September 2015 and really enjoyed our time there. We took the train to Nuremberg one day and took a "Combo Tour" of the Nazi Rally Grounds and the "Judgment at Nuremberg" courtroom with Tour Guide Kevin (http://tourguide-kevin.com/nazi-party-rally-grounds). After the tour we wandered around the old town and had a great meal before taking the train back to Munich. An easy and fun day trip.

On the other hand, one of the unexpected highlights of our trip turned out be the BMW World and Museum. BMW World is free and is like the glitziest car showroom you can imagine. It is a fun place to wander around with a bar and places to eat. If you plan ahead, you can test-drive a BMW on their track or arrange for a factory tour. The museum isn't free, but it was tremendously interesting - I am not a car buff and not a particular fan of BMW's, but the museum reminded me of the Tate Modern in London, only with cars and motorcycles. We spent several hours there. Across the street from the BMW sights are the grounds of the 1972 Olympics.

I put BMW World and Museum in our itinerary as something of a bone to throw to my husband, to reward him for going to all the art museums that I wanted to see. Funnily enough, I enjoyed "BMW Day" even more than he did.

If I had a whole day to use, the Deutsches Museum would be on my list. If you spend enough time in each exhibit, it would take more than a day, so plan accordingly. The aviation exhibit is outstanding. Although I realize their is another, even more extensive, aviation museum in Oberschleissheim (also part of the Deutsches Museum), there are additional, very interesting exhibits (mining and bridge building, for example) at the in-town facility.

I am an enormous history buff and was in Nuremberg in December 2015. I did the Combo Tour traylaparks mentions with Tour Guide Kevin. It was really good; it was pretty crazy to stand on Hitler's perch at the Nazi Rally Grounds. I also did a tour in Munich with Stefan Biro (https://tourguides.viator.com/tour-guide-stefan-b-43867.aspx); it was a combination of his Munich City Tour and his Third Reich tour. It was excellent, but the combined tour made for a long day. Perhaps just doing the Third Reich tour would be a reasonable plan (especially since it will be cold!).

We honestly had never heard of the Deutsches Museum, and ended up spending almost an entire day. It was fascinating, one of the best museum experiences anywhere ( and we do a lot of museums). Regensburg and Bamberg are beautiful ( we did train day trips from Nuremberg) and might be possible if weather and logistics align. We walked all over both towns, no particular must do's, just wandering. The Alte Pinakothek in Munich was outstanding if you like painting; they had an extensive collection of Rubens. Safe travels!

I'm not a beer person, and I like historical sights, museums, and cultural experiences.

So why not visit a couple of other remarkable churches? St. Michael (Renaissance outside, Jesuite Baroque inside), Bürgersaalkirche and Theatinerkirche (Italian baroque, the latter one stylistically depending on St. Andrea della Valle in Rome), Asamkirche (Bavarian roccoco, not to be missed).

Besides the Deutsches Museum there are a handful of other remarkable Galleries and Museums: Alte Pinakothek (mentioned above), Neue Pinakothek (19th century painting), Museum Brandeis (modern art), Lenbachhaus (18 / 19th century), Sammlung Schack; Glyptothek (small but outstanding collections of Greek and Roman sculpture, includung the pediments of the temple of Aphaea in Aegina).

Have fun!

I loved Nurnberg (Documentation Center, courtroom, old town center) and Bamberg (cathedral, old town center). I was not so fond of Munich.