to respond to my own query...
My birdwife and I visited the Toronto Islands yesterday. The walk around was more than pleasant, and all the usual winter waterfowl was seen, with the added highlight of 4 or 5 white-winged scoters, and GBB gull, and one that I'm pretty sure was a young Glaucous, but I'll have to post the pics and let you gull experts have a look...
I guess the Island is known mostly as a spring and fall hotspot for migrants?
Best to you all,
David B.