@LFF
The tram tours operate from 14 May til 03 October and leave from
Sendlinger Tor (at the fountain opp. Matthäuskirche) on Saturdays, Sundays and public holidays at 11:00, 12:00, 13:00 and 14:00.
Duration of the tour is about 45 mins.
Tickets are €7 for adults and kids under 140 cm (hmmm...) ride free. Family tickets (2 adults & 2 kids) are €10.
You can buy the tickets when you board and they don't take any reservations. (Well, if you going to go with a really large group, you can hire your own 'party tram'.)
MünchenTramTramtours(Both sites are in German)