The Mimico Creek Estuary (this separates Humber Bay East park from Humber Bay West park) is pretty reliable for a Northern Pintail. There has been a nice male here for a few weeks, seen again this morning. See this map, where the green arrow is:
http://g.co/maps/443arNote that the map photo is old, the area in question has been pretty much segregated from the main part of the creek in recent years. As a result, you cannot see the area in question from the west side of the creek, you need to be on the east side.
Also seen in the same location: 2 Killdeer, Great Egret, 10+ American Wigeons, 3 American Black Ducks.