Vacationers bound for Grand Canyon National Park may want to take the train this summer. Park superintendent Boyd Evison says 3,800 cars are currently arriving each day, and 6,400 vehicles will pack the park during the peak months of July and August. With only 1,600 parking spaces in the South Rim Village, that means drivers can look forward to a quintessential urban experience: searching for some place to put the car. Park staffers suggest tourists leave their vehicles in Flagstaff or Williams, then take a bus or two-hour train ride to the park.