Argh, Chris got me! I'll do my best with this one, though it may be tricky since I'm not certain of the names of the many parks I visited as a kid. When you're rattling around in the back seat with your brother, you tend not to pay attention to things like park entrance signs!
Ones I've been to in bold. Ones I've not been to in italics. The remainder are ones I'm unsure of.
Acadia National Park (Maine))
National Park of American Samoa (American Samoa)
Arches National Park (Utah)
Badlands National Park (South Dakota)
Big Bend National Park (Texas)
Biscayne National Park (Florida)
Black Canyon of the Gunnison National Park (Colorado)
Bryce Canyon National Park (Utah)
Canyonlands National Park (Utah)
Capitol Reef National Park (Utah)
Carlsbad Caverns National Park (New Mexico)
Channel Islands National Park (California)
Congaree National Park (South Carolina)
Crater Lake National Park (Oregon)
Cuyahoga Valley National Park (Ohio)
Death Valley National Park (California, Nevada)
Denali National Park and Preserve (Alaska)
Dry Tortugas National Park (Florida)
Everglades National Park (Florida)
Gates of the Arctic National Park and Preserve (Alaska)
Glacier National Park (part of Waterton-Glacier International Peace Park) (Montana/Alberta)
Glacier Bay National Park and Preserve (Alaska)
Grand Canyon National Park (Arizona)
Grand Teton National Park (Wyoming)
Great Basin National Park (Nevada)
Great Sand Dunes National Park and Preserve (Colorado)
Great Smoky Mountains National Park (North Carolina, Tennessee)
Guadalupe Mountains National Park (Texas)
Haleakala National Park (Hawaii)
Hawaii Volcanoes National Park (Hawaii)
Hot Springs National Park (Arkansas)
Isle Royale National Park (Michigan)
Joshua Tree National Park (California) (I went there when it was still only a Monument - does that count?)
Katmai National Park and Preserve (Alaska)
Kenai Fjords National Park (Alaska)
Kings Canyon National Park (California)
Kobuk Valley National Park (Alaska)
Lake Clark National Park and Preserve (Alaska)
Lassen Volcanic National Park (California)
Mammoth Cave National Park (Kentucky)
Mesa Verde National Park (Colorado)
Mount Rainier National Park (Washington)
North Cascades National Park (Washington)
Olympic National Park (Washington)
Petrified Forest National Park (Arizona)
Redwood National Park (California)
Rocky Mountain National Park (Colorado)
Saguaro National Park (Arizona)
Sequoia National Park (California)
Shenandoah National Park (Virginia)
Theodore Roosevelt National Park (North Dakota)
Virgin Islands National Park (U.S. Virgin Islands)
Voyageurs National Park (Minnesota)
Wind Cave National Park (South Dakota)
Wrangell-St. Elias National Park and Preserve (Alaska)
Yellowstone National Park (Idaho, Montana, Wyoming)
Yosemite National Park (California)
Zion National Park (Utah)

I don't think I have been in any of the parks in Chris Clarke's list, though I have been to other NPS lands (e.g., Muir Woods National Monument, Rock Creek Park, Chesapeake & Ohio Canal National Historical Park, Gateway National Recreation Area, Blue Ridge Parkway, etc.).
Posted by: John | 2009.01.12 at 07:16 PM