The key is to stay to the far right at the MK toll plaza (just to the left of the bus lane) instead of being in the lanes that go to the parking lot. It's the same as driving to the Polynesian, except that the TTC drop-off (and very-short-term parking) is before you get to the Polynesian. Despite what it says in post #2, this does not involve walking under the road.
There's frequent monorail and ferry service from the TTC to the MK.
Also, despite what it says in post #2, the Contemporary is not meant for MK drop-off. The guard at the Contemporary parking lot gate is likely to direct you to the TTC drop-off location instead of waving you into the Contemporary parking lot.