Isle Royale National Park in Michigan offers remote wilderness, rich wildlife, and stargazing without the crowds. Its location in Lake Superior combined with the boat- or plane-only access keeps visitor numbers low. The park is ideal for backpacking, paddling, and aurora viewing thanks to its rugged terrain and dark skies. On a clear, warm May night in Michigan, I sat atop a rock and eavesdropped on howling loons as the northern lights shimmied above a mirror-still lake with no other soul in sight. It’s the kind of secluded awe national park travelers dream about, but it’s increasingly tough to find in well-trodden showstoppers like Zion , Arches , and Great Smoky Mountains national parks. That’s why I’ll forever urge nature lovers to follow my footsteps to Michigan’s far-flung Isle Royale—arguably the most underrated national park in the U.S. It’s also among the country’s least-visited. The 850-square-mile Isle Royale National Park is in an isolated stretch of Lake Superior.…