Before starting 4th grade, Abigail Tidlow-Tranel and her family spent five days backpacking the Chilkoot Trail -- a 33-mile-long hike that spans from Klondike Gold Rush National Historical Park, Alaska, to a neighboring national park site in British Columbia. Abigail is one of the four million 4th graders (and their families) that get a free pass to federal lands and waters thanks to Every Kid in a Park.