My girlfriend and I spent 3 night in Munich, from the 19th to the 22nd of August. We stayed in an hostel, near the main train station.Marienplatz and the Neues Rathaus
Of course, the first thing you should visit in Munich is Marienplatz and the Neues Rathaus, the new town hall.
The Neues Rathaus.
On the eastern side of Marienplatz, you can find the old town hall, known as Altes Rathaus.Deutsches Museum
Located on the so called museuminsel, The Deutsches Museum is the world's largest museum about science and technology. It was founded on 28 June 1903.
Another museum we visited during our stay is the Paläontologisches Museum. It is quite small, but it's absolutely worth a visit (and it's free!).