9,980,000 of those 10 million visitors arrive in a car, truck, or RV, walk less than 1km, stay on the marked trail between the visitor center and the gift shop, and leave in less than 4 hours so they can hit the outlet mall before checking into the hotel, overeating at the buffet, and falling asleep watching pay-per-view. Unless they trip and fall in the rush to the ice cream vendor or have a fatal heart attack from walking the 1km, there isn't that much that can go wrong. America!

Park staff activities tend to be a wee bit more risky.