I don't assume it's me as there are some people (looks at F4) who have me by a couple of decades and have traveled more. But I've got almost half of the 59.
I've been at least once as an adult to:
Acadia
Arches
Big Bend
Biscayne
Bryce Canyon
Canyonlands
Capitol Reef
Carlsbad Caverns
Channel Islands
Congaree
Death Valley
Everglades
Grand Canyon
Great Sand Dunes
Great Smoky Mountains
Haleakala
Hawaii Volcanoes
Joshua Tree
Mammoth Cave
Mount Rainier
North Cascades
Saguaro
Sequoia
Shenandoah
Yosemite
Zion
I've been at least once as an adult to:
Acadia
Arches
Big Bend
Biscayne
Bryce Canyon
Canyonlands
Capitol Reef
Carlsbad Caverns
Channel Islands
Congaree
Death Valley
Everglades
Grand Canyon
Great Sand Dunes
Great Smoky Mountains
Haleakala
Hawaii Volcanoes
Joshua Tree
Mammoth Cave
Mount Rainier
North Cascades
Saguaro
Sequoia
Shenandoah
Yosemite
Zion
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