Accessible only by ferry, personal boat, or float-plane service, Isle Royale National Park--perched in the northwest corner of Lake Superior--is worth the extra effort to get there. Fewer than 20,000 people a year visit the park, but the island has a loyal following. The average visit to Isle Royale is four days, compared to a few hours at the Grand Canyon. Though closed in the winter months, summer at the park is warm and fall foliage provides a colorful backdrop for potential sightings of rutting moose. Not for the faint of heart, park visitors should prepare for rugged canoe portages and primitive-backcountry hiking and camping.
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Free backcountry permits are required for the island's 36 campgrounds.