Detour to Paris. Book the Thalys for travel from Brussels to Paris in just over an hour. You can catch the Paris-Munich overnight train with sleeper cars, so you can arrive fresh in Munich in time for breakfast. The upgrade price for a shared sleeper will run you about $100.
Head to Frankfurt. Both the Lyria and ICE run to Frankfurt with an easy connection to Munich. There are 22 daily ICE trains from Frankfurt to Munich.
Try to book as many ICE trains as possible. These newer trains offer a comfortable ride from Brussels all the way to Munich. If it works for your schedule, stick to these trains for travel. You will need to transfer in Frankfurt.
Book your ticket from an agent instead of a machine when traveling in a group. Most lines from Brussels to Munich will offer a group discount for groups of four or more, depending on the departure time of your train. If you want to get your ticket beforehand, you can call Rail Europe at (888) 382-RAIL or visit the link below.
Transfer easily to U-Bahn, subway, trains from the train station in Munich. Hauptbahnhof, which is the main train station, is right in the heart of Munich.
Try to avoid the area around the train station at night. While most of Munich is safe, this area turns a bit seedy in the dark. Try to pick a hotel away from the station.
Purchase a Zeitkarte pass for unlimited travel on public transportation if you plan to stay in Munich for more than a week. The cards are available the main train station.