The easiest way to go from Günzburg to Munich (if you don't want to drive around in the centre hunting for parking space) is using a train. Especially for a group of people its probably your best choice. Depending on the train connection it will roughly take between one hour and 90 minutes from Günzburg to Hauptbahnhof.
From there you can take the underground everywhere.
If you plan to use a car prepare to park somewhere at the outskirts and then use public transport from there.
The store in Riem is at the other end of Munich. The new one in Pasing is not very far away from Haubtbahnhof. Somebody mentioned the Müller chain. They also own the Obletter toystore located on Karlsplatz (Stachus) right besides Europe's most busy McDonalds (sightseeing anybody?). If you want to visit a store besides the Lego store you probably want to check out that one.
I might want to join you in Munich, probably have no time to spend the whole weekend in Günzburg though
























