If you have a car and about 1-2 hours to use up via exercise, and love views and beautiful flowers in August, take a ride up Mount Royal. This is the only real elevated area in Montreal,(if you ride the incline at Olympic stadium this will be verified). At the top of the mountain is an extremely large Lit(at night) cross/crucifix that could be seen for miles. You really can't get to that area without lots of walking but ride up there to see a beautiful view of the city(for free), lots of people exercising and taking pictures, and a beautiful chalet type building with lots of stairs for resting, beautiful flower areas for viewing and just a break from a busy city. I think you need to pay for some parking via a machine and get a ticket to put in the inside of your windshield. We did not do that due to our negligence, but noticed these tickets when we walked past other cars. Elderly people and those who cannot walk about 1/2 mile should probably avoid this area, but a very pleasant spot with great vistas and opportunites for photography. Also very, very clean as all of Montreal is.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.