Munich is very nice - use the time.
here you got the top 20 sites there:
http://www.muenchen.de/sehenswuerdig...n.html?index=1
I`d say go into the center and pick 2 or 3 and then go into the Hofbräuhaus
www.hofbraeuhaus.de
this is a real classic!
With cab or public transportation your quite quickly back at the airport - unless you get drunk comletely
have a good
time