You mention that Niagara-on-the-lake may be in your plans. I would highly recommend visiting some of the wineries there and other placed along the Escarpment. Take a look at http://winecountryontario.ca/Niagara...-Twenty-Valley, and you'll see literally dozens of (mostly) small wineries that are great places for landscape photography. Sweeping vistas down into the valley, rows and rows of vines growing up the slopes of the Bench, old barns etc.

Oh, and wine.

I go twice a year when I make it home. Enjoy your trip.