This image shows several swimmers resting on a short boat dock extending into the waters of a fair-sized lake somewhere in Michigan. In the background are lakefront properties and homes as well as a boat or two.

The description states:
G118
“When fishing’s done — Swimming’s fun.”
Vacationland Scene
–Such lakes are common throughout the Great Lakes states, a result of the glaciation that left both depressions scoured into the landscape by glaciers and the water left when the glaciers melted.
This card is dated 1955.