DON'T POSE WITH WILD ANIMALS A woman and her six-year-old daughter were snapping a selfie in Yellowstone with backs turned to a wild bison–only six yards away. The massive animal attacked and tossed her into the air; she escaped with only minor injuries.
DON’T BREAK THE RULES A tourist dove headfirst into the scalding 200°F Celestine Pool—one of Yellowstone National Park’s 10,000-odd geothermal features—to try to rescue his friend’s yelping dog in 1981.
DON'T FLY DRONES A tourist seeking to take photos in Yellowstone crashed a camera-equipped drone into its largest hot spring, the Grand Prismatic Spring. The 2014 incident followed a ban on these so-called unmanned aerial vehicles and left park officials puzzled over how to fish the equipment out of the prized geothermal feature.
DON’T FEED WILD ANIMALS A boy picnicking with his parents near Yosemite National Park’s Wawona Hotel in 1977 died from a stab wound by sharp antlers after he offered a potato chip to a mule deer.
DON’T HIKE IN HEELS In order to prevent injuries in Grand Canyon National Park, park rangers at the top of the winding Bright Angel Trail have to remind glamorous tourists that the rocky terrain is a pain for anyone wearing high heels.