Grand Canyon National Park, AZ Professional Review and Guide
"Dramatic beauty, awesome vistas, fascinating natural and cultural history: The Grand Canyon must be seen to be believed. Created by the uplifting of the Colorado Plateau and the erosion caused by the Colorado River, the canyon stretches 277 miles across northern Arizona and is approximately a mile deep. Most visitors experience the canyon by traveling along its rim, stopping to take in its majesty via different vantage points. The South Rim, which includes Grand Canyon Village and Desert View, receives 90 percent of park visitors and is open year-round.
This is one area where it’s imperative to keep young children firmly in hand; even where there are barriers, unattended kids have been known to climb over them. At more than 7,000 feet above sea level in some places, the canyon’s elevation may cause dizziness and shortness of breath. Also, because the North Rim is more than a hundred miles from a fully staffed hospital, we don’t recommend it for families (it’s briefly described later). Enjoy the scenery, but remember to hold onto younger children, and be sure the older ones know the rules."