<human>:  What are the best hiking trails in the US National Park System?
<bot>: The best hiking trails in the US National Park System vary depending on individual preferences, but some of the top rated trails include Bright Angel Trail in the Grand Canyon National Park in Arizona, Alum Cave Trail in the Great Smoky Mountains National Park in Tennessee, and Mount Saint Helens National Volcanic Monument in Washington. Other great hiking trails include Kalalau Trail in Hawaii's Kalaupapa National Historical Park, Glacier Gorge in Rocky Mountain National Park in Colorado, and Mount Rainier in Washington's Mount Rainier National Park.