This image shows a quaint horse-drawn carriage with two smartly dressed drivers, parked in front of the historic Grand Hotel on Mackinac Island in the straits between Lake Michigan and Lake Huron.

The caption states:
THE GRAND HOTEL
Mackinac Island, Michigan
The Grand Hotel is the outstanding resort hotel in the middle west. This largest summer hotel in the world is a much sought after convention site and has been host over the years to scores of well known personalities.

–The hotel was built in 1887 and was the second National Park in the United States. It has since reverted to being a Michigan State Park.

This card is dated 1955.