Ok, so not technically a playground, but I’ll call it a park.
There’s grass, paths, and room to run. So there.
This is a nice spot to visit just to look at the water/canal, see the boats and ducks, and walk or stroller along the path.
There is lots of (paid) parking along Boulevard Saint-Joseph, or there are a couple of lots. We parked in the lot near City Hall on 18e avenue.
There are tons of restaurants along the road, or visit the Lachine Museum and teach the littles all about the fur trade and the “olden days”!