During Oktoberfest crime and staggering drunks are major problems, especially around the Hauptbahnhof. It's no joke: drunks in a crowd trying to make their way home can get violent, and there are around 100 cases of assault every year. Leave early or stay cautious – if not sober – yourself.
Strong and unpredictable currents make cooling off in the Eisbach creek in the Englischer Garten more dangerous than it looks. Exercise extreme caution; there have been deaths.
Fast-moving bikes in central Munich are a menace. Make sure you don't wander onto bike lanes, especially when waiting to cross the road and when alighting from buses and trams.