Zion National Park is the 3rd most visited park in the entire nation. From March-November, and part of December, they have a shuttle system to help with the crowds. We didn't like the idea of taking four kids on a shuttle with all their hiking gear and hoping nothing got left behind. I mean, we have a kid who tends to leave his shoes in the car, in the middle of winter, after we told everyone to make sure they were wearing them. To avoid lost shoes on a public shuttle, and the heat, and the thickest crowds, we chose to go in the winter. This however, presented another problem.