<human>: What is the best place to go hiking in the United States?
<bot>: The best place to go hiking in the United States is Yellowstone National Park. It has a variety of trails for all levels of hikers, including easy day trips and more challenging multi-day treks. Other popular destinations include Rocky Mountain National Park in Colorado, Grand Canyon National Park in Arizona, Glacier National Park in Montana, and Yosemite National Park in California.