Lake Michigan Archipelago National Park

Why not? Makes sense when you read this and this. And it would protect this:

The Beaver Archipelago is a chain of 13 islands casually scattered across northern Lake Michigan. The archipelago lies 25 miles northwest of Charlevoix and 50 miles southwest of the Straits of Mackinac. Some of the islands are little more than overgrown sandbars, but others—Squaw, High, Hat, Garden, Hog, Gull, Trout and Whiskey—are considerable. The largest in the chain, and the largest island in Lake Michigan, is Beaver, some 13 miles long and six wide.