Montreal has a wonderfully preserved and refurbished old port and old city. There are numerous options. This map starts at Place Jacques Cartier, and runs down to the paths in the Old Port and the “Basin de Horloge”. This area is turned into a skating rink in winter. Heading back west, you’ll pass by the famous Notre Dame church.
Add-On Options: Lachine Canal Path, ~3 miles to Atwater, or head east along Rue Notre Dame and over to Parc Jean Drapeau (St. Helen’s Island).