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Acadia is, admittedly, a summer park. In winter, the Park Loop road, as well as all unpaved roads, close to traffic, a blanket of snow settles over everything and the park falls into a deep slumber. But there's still access via local highways, and plenty of opportunities for outdoor fun. Our favorite is ice climbing spray ice above the crashing waves of the Atlantic on the famed granite sea cliffs at Great Head (called “the biggest, baddest sea cliff in America” by Rock and Ice) and Otter Cliffs, where the park maintains dedicated top-rope anchors. But spray ice can be unreliable here, so local experts Acadia Mountain Guides tend to take clients to frozen waterfalls in the park. As a bonus, the 50-plus-mile carriage road system, which winds through forests and along cliffs, makes for excellent—and ridiculously scenic—Nordic skiing.