VISITORS \ By the numbers The 10 busiest national parks -- Great Smoky Mountains, Grand Canyon, Yosemite, Olympic, Yellowstone, Rocky Mountain, Zion, Cuyahoga Valley, Grand Teton and Acadia -- each

Kobuk Valley National Park in Alaska: 5,037.
Lake Clark National Park and Preserve in Alaska: 5,408.
Gates of the Arctic National Park and Preserve in Alaska: 9,459.
Isle Royale National Park in Michigan: 17,398.
North Cascades National Park in Washington state: 18,686.
Katmai National Park and Preserve in Alaska: 54,274.
Wrangell-St. Elias National Park and Preserve in Alaska: 56,224.
Dry Tortugas National Park in Florida: 61,765.
Great Basin National Park in Nevada: 77,741.
Congaree National Park in South Carolina: 84,301.
Guadalupe Mountains National Park in Texas: 170,383.
Black Canyon of the Gunnison National Park in Colorado: 180,814.
Voyageurs National Park in Minnesota: 234,577.
Kenai Fjords National Park in Alaska: 258,297.
Great Sand Dunes National Park and Preserve in Colorado: 279,589.
Glacier Bay National Park and Preserve in Alaska: 359,829.
Lassen Volcanic National Park in California: 365,535.
Canyonlands National Park in Utah: 393,381.
Redwood National Park in California: 394,144.
Big Bend National Park in Texas: 398,583.
Denali National Park and Preserve in Alaska: 403,520.
Carlsbad Caverns National Park in New Mexico: 413,786.
Channel Islands National Park in California: 434,107.
Crater Lake National Park in Oregon: 447,240.
Theodore Roosevelt National Park in North Dakota: 493,198.
Mesa Verde National Park in Colorado: 498,333.
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