For the past three years, my annual birthday challenge has involved riding my bike across a national park. With Haleakalā and Yosemite under my belt, this year I went in search of tall trees and deep canyons at Sequoia & Kings Canyon National Parks. Sequoia is home to the largest living tree in the world by volume, General Sherman, while Kings Canyon not only shelters the largest remaining grove of giant sequoia trees, but also features one of America’s deepest canyons.