(Leah Hogsten | The Salt Lake Tribune) Zion National Park hikers hoping to beat the crowds on park trails wait their tun in line to catch a free shuttle at first light. Every bus leaving the Zion Canyon Visitor's Center in the morning is filled to capacity, carrying some 60 people in each car of the two-car shuttle. "This is nothing," said shuttle host Celeste Fuentes about the endless rows of hikers. "Sometimes it's all the way to the parking lot."