Lake Bonney is Barmera's reason for being a visitor stop. The lake is wide, open, and easy to reach from town, with foreshore lawns, swimming areas, and enough space for sailing, water-skiing, canoeing, and fishing.
It is also a fine low-effort place to do very little. Come late in the day if you are not getting on the water; the sunsets can turn the whole lake copper, and the Riverland heat softens quickly once the sun drops.