I went to BMW World during my 2nd mileage run to MUC in Dec, and it was pretty cool. It was very easy to access it from the U-bahn/subway. I spent about an hour or so there, looking around at all the vehicles, concept cars, browsing the shops, etc. Then I walked around the Olympic Park (just next door), went up the tower. Unfortunately, the BMW museum was closed (they were moving it from one location to another). And I didn't think to plan ahead and arrange a tour in advance...they were sold out several days ahead.
Of course since I returned, I now want an X3, and I want to do the delivery in Munich....maybe someday.