Best Holiday destinations in USA

Please suggest some of the best holiday destinations in the USA for this summer.

Any of the national parks.  Specifically:

Zion National Park, Utah
Arches National Park, Utah
Grand Canyon National Park, Arizona
Yosemite, California
Carlsbad Caverns, New Mexico
Yellowstone, Wyoming
Kings Canyon, California
Bryce Canyon, Utah
Canyonlands, Utah

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