This is James Parker reporting. Yosemite is amazing! The rock walls here are thousands of feet high .   The Parkers, an intrepid family of four, hit the trail once again, this time in Yosemite, one of the country's most popular national parks. Ten-year-old twins James and Morgan take in the beauty of the sequoia trees and attempt an ascent of the exciting "cables" route on Half Dome. Will they make it to the top? Each book in the exciting Adventures with the Parkers series for kids 813 explores a popular national park and is packed with adventure as well as engaging and educational facts about nature, outdoor safety, and much more. Vacation has never been this fun!   Books in the Adventures with the Parkers Series: Bryce Canyon and Zion National Parks: Danger in the Narrows Glacier National Park: Going to the Sun Grand Canyon National Park: Tail of the Scorpion Great Smoky Mountains National Park: Ridge Runner Rescue Mount Rushmore, Badlands, Wind Cave: Going Underground Olympic National Park: Touch of the Tide Pool, Crack of the Glacier Rocky Mountain National Park: Peril on Longs Peak Yellowstone National Park: Eye of the Grizzly Yosemite National Park: Harrowing Ascent of Half Dome.