A bus tour can include more outlying sights, namely the Olympic Park and the Nymphenburg Palace. You could even visit the main rooms of Nymphenburg, just to give you an example. There is a wide variety of options depending on your time schedule. 

You might want to opt for a combined tour, bus and walking, so you can also see sights in the pedestrian zone. For reasons of communication, however, your group should comprise no more than 30 people for a walking tour. If your group is larger we would offer a second guide.