If only there were more than 24hrs. in a day you'd likely find me at one or two of these locations:
Bickford Oak Woods
Back in 2007 I did two rounds of breeding bird surveys in Bickford Oak Woods, consisting of a total of 7 days here...it was buggy, the American Prickly-Ash was pretty damn annoying in certain spots, and wet...but it was also really interesting and one location I hope to get back to in the near future in June. Over the course of our fieldwork, we found the Swamp Cottonwood grove, a singing male Acadian Flycatcher, 3 male Cerulean Warblers, Red-headed Woodpecker and Brewster's Warbler. Not too mention that there's a large swamp (I vividly remember wading chest deep for >100m) that screams Prothonotary Warbler (Larry Cornelis had a singing male PROW here in 2001 or 2003).
I've only birded Moraviantown FN once (June 24, 2015), but was impressed with the quality and numbers, as well as several Species at Risk and Species of Conservation Concern present in only 45 minutes of driving, including White-eyed Vireo and several Hooded Warblers. I'd love to go back for a morning, and would expect Cerulean Warbler and Acadian Flycatcher as high candidates.
Chippewa's of the Thames FN
For the first time last year, I checked out the Chippewa's of the Thames First Nations, on June 13th and 21st and wasn't disappointed....a total of 3 Cerulean's, a Prothonotary, and several Hooded Warblers made it a great morning. Other things like Yellow-throated Vireo and Blue-winged Warblers were also plentiful (~10 of each species).
I haven't ever checked out Wainfleet in the summer, but recently toured the area and was really impressed with some of the habitats along the road, particularly in the western area of the natural area. Species like Prothonotary Warbler and King Rail really stand out as having suitable habitat here...hopefully I'll be able to check it out this June! If there are any Niagara birders who read this...I'd definitely check it out!
Hopefully this spur some birders to check these areas out (or other hotspots)!