Hi Cody,
If you walk north/south along Grenadier Pond (Grenadier Pond runs basically from Bloor St. to LakeShore Blvd.) you will see much worth photographing. Unfortunately, the pond seems to be very quiet right now with the swans, ducks and even the geese being rather secretive during their nesting); however, it is a lovely spot and you are guaranteed to see a lot of birds also. There are definitely still about six wood ducks at the very northerly portion of the pond. There is also a Great Egret that hovers around.
As for some warblers there is a spot behind the tennis courts and just in front of the allotment gardens so if you enter the park from Bloor St. the tennis courts are just a short way south and just slightly beyond that and sort of tucked away are the allotment gardens and, as indicated, there is usually some good birdings spots in there.
Please don't hesitate to ask me any questions at all about High Park as I visit there every day. I hope you enjoy yourself.