Maine’s Mount Desert Island has a year-round population of only around 10,000, but it hosts millions of visitors each year who come to see the stunning, rugged landscapes of Acadia National Park. This national park is one of the best spots to paddle the U.S. coastline, and visitors can also hike, camp and view gorgeous sunrises over the Atlantic. Those looking for more solitude can find more secluded parts of the park across the bay on the Schoodic Peninsula.