Jeff,
I agree with allbim - take in the Deutsches Museum - it truly is amazing for anyone that is a gear head. Look for the display of old BMW plane motors in the aviation hall. Also, take a guided tour, its well worth it.
I dont know if tehy're still doing it or not, but in the "hourglass" section at the front corner of the BMW Welt building, they were offering test drives of new cars. I took the one hour run, which was around 20 Euro,(there was a 4 hr run that included lunch on the road, but it was more $$$) they give you 20 Euro worth of coupons for any of the food service facilities inside the Welt, so its well worth it. There are predetermined routes that are programmed into the idrive, but i ran north up the autobahn to Garching and went snooping around at BMW M.
Lastly, if you're looking for a interesting dinner experience, something not German, and you like meat - go to Charrascuria Brasil its at Brunnerstrasse 2 in Munich. Dinner is served in the basement of this beautiful old house in the middle of Luitpold Park. You can get there on U3 getting off at Scheidplatz, and its a short walk through the park. When you get there order the Rodizio, this is the full dinner with all different types of meat carved tableside. Desert is a pineapple, flambed tableside - its AWESOME....if you like pineapple...LOL
Reservations are recommended, as they only serve Rodizio until a certain time in the evening - have the front desk at the hotel help you out with that.
Have fun!
Martin