Great area: Lachine canal, recreational path, the Atwater market, parks, boat rentals, beer at St.Ambroise - lots of things to do and experience. Bring your dog!
The area used to be an industrial zone but now it is converted to a recreational and residential area, a little green oasis in the city. May be not as pleasant in winter as snow is not removed from the paths but during other seasons it's a nice place to spend a weekend. Get a nice view on downtown from the southern shore of the canal around Corticelli lofts. Read posts about the industrial path of the canal and see conversions of industrial buildings into residential lofts. Rent a canoe, pedalo, or a small electric boat to go along the canal. Take the path all the way to the east to the Old Port or to the Park Rene-Levesque, a little jewel all the way to the west.
Just one warning: when walking along the path beware of cyclists: they show complete disregard of the rules (like the speed limit and walking a bike in busy areas and bridges) and often verbally insult other users of the path for "being on their way". The path does not belong to bikes. It's also shared by roller-bladers, runners, and simply walkers, often families, mothers with strollers. In some places the path splits in two, separating faster users, but in some places it is shared, and that's when unpleasant and I would say stressful encounters with cyclists occur.
The city should really do something about this before someone's hit by a bike.