"The Cove", on the shores of Trout Lake, is a great place for families to bring their children for a swim on hot days. The water is cooler and cleaner than Lake Nipissing and kids love playing on the long white docks. The beach is supervised by lifeguards during the summer months and has restroom/change facilities. There aren't any food or drink vendors at this beach, so you have to bring your own snacks. There's lots of space at this beach, so even on busy days you can always find a good spot to stretch out. Make sure to have a shower with soap when you get home to avoid any chance of "swimmer's itch", which has been known to happen on some summer days. I grew up hanging around on this beach.
Entrance at the corner of Lakeside Drive and Camelot beside Found Court, in the Birchaven neighbourhood.