The green-domed towers are the Paroisse St.-Irénée church up by the Lionel-Groulx métro station where I started my walk.
The canal is a corridor in transition. It's changing from abandoned/underutilized industrial to residential and office uses. I think it will be a very nice place as it continues to fill in. My walk took me from Atwater to the Vieux Port and Old Montréal, where I stopped for brunch. Here's a map I made of my route:
I rode the métro from the hotel to my starting point (the green box with the white arrow inside), then walked along the red route back to the hotel (the red box with the white dot inside). The total route was about 6.5 kilometers (about 4 miles); the numbers in the gray boxes are the kilometer markers.