\" \" Visitors enjoy the beauty of Hozomeen, at the northern end of Ross Lake NRA, in North Cascades National Park, Washington, one of the least-visited national parks. Dry Tortugas National Park: 54,281 recreational visits\" \" An aerial view of Fort Jefferson at the Dry Tortugas National Park, off Key West, Florida. North Cascades National Park: 30,326 recreational visitsNorth Cascades National Park is less than 2.5 hours by car from Seattle. Lake Clark National Park and Preserve: 22,755 recreational visitsThere are no roads to Lake Clark National Park and Preserve, which, like Katmai National Park, is located in the wild lands of the Alaskan Peninsula. Kobuk Valley National Park: 15,500 recreational visitsYou can leave the Jeep at home before you head out for Kobuk Valley National Park in Alaska.