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Virgin Islands National Park, U.S. Virgin Islands
About half a million people visit the U.S. Virgin Island of St. John each year, but many are unaware that they're stepping onto an island that’s more than 60 percent national park. St. John's tropical rainforest offers miles of hiking trails, while stunning Trunk Bay features a trek of an entirely different kind: an underwater snorkeling trail — complete with readable signage — along spectacular coral reefs teeming with marine life. Most of tiny Hassel Island, off nearby St. Thomas' coast, is also part of Virgin Islands National Park.
(Photo: Dara Continenza)