Lake Huron’s Georgian Bay is home to the world’s largest freshwater archipelago, a mass of small islands studded with windswept pine trees that cling stubbornly to crevices in the weathered granite. Since the early twentieth century, this remote and rugged region, known as Thirty Thousand Islands, has attracted intrepid nature-lovers in search of an unspoiled environment with varied recreational opportunities. Some of the earliest of these hardy outdoor enthusiasts ventured forth in long skirts and large hats. More than a century ago, a group of young, single, professional women began…