You can entry the park on John Drury Dr just off Sheppard. Continue on John Drury Dr until you see a a small roundabout, you can park there and continue on foot. You will see the Downsview forest (a lot of newly planted trees with white protectors on the stems) in front of you. There are some good wetter areas of the forest closer to the lake. Also there is a Kestrel that likes to hang out on the telephone wire near the entrance to the forest. Good luck and let me know how it goes.
So far today I have seen some Flickers, a red tailed hawk, Northern Mockingbirds, red-winged blackbirds, Blue Jays, some warblers (couldn't identify them), Kill deer, and the Kestrel!
Jonny