(Photo courtesy of Zion National Park) Up to 400 bikes are parked at the Temple of Sinawava, a popular trailhead in Zion National Park. Since the park's reopening May 13, bicycling has become a popular way to tour Zion Canyon in the absence of the park's shuttle service. Starting July 1, cars were barred from the canyon as the shuttle service resumed using modified buses to enable social distance. Reservations are required.