Just off the main strip in Lac du Bonnet, you can head to the beach for a dip and a picnic. The beach has lots of sand leading down to the water and is occasionally supervised by a lifeguard.
Onsite there are picnic tables, benches, washrooms, and a historic monument to bush pilots. Just off the beach in the town you can also find food, beverages, and kitsch for sale. Between the beach and the town, it's easy not only to picnic but make a day of it.