Do not venture to the edge of the Canyon. Do not walk around on the Canyon rim looking through binoculars or your camera view finder, your depth of field is looking through the camera and not reality. You can step right off the side of the Canyon. Watch children and pets at all times. Medical emergencies can be reported to 911 or by using any of the emergency phones dispersed throughout the park and on selected hiking trails.
Heat can kill.
Although both the North Rim and the South Rim of Grand Canyon are rather comfortable, the less shaded South Rim can get hot in the summer. Even if you do not plan to do any hiking, you should wear a hat, carry one quart of water with you at all times, wear sunscreen, and wear sunglasses. If you start to feel nauseated, weak, tired, or feel like you cannot cool down, you are showing signs of heat stress. Listen to your body and get into some shade. Medical emergencies can be reported to 911 or by using any of the emergency phones dispersed throughout the park and on selected hiking trails.