The Grand Canyon is an absolutely humbling sight. As any guide book will say, the sunrise and the sunsets are the best time to experience it if just viewing. The shadows, colors and movement are surely memorable. We parked at Mather Point and walked around from there. If there is a full moon, you can watch it set as the sun rises. Be sure to check out Bedrock City to the south of the visitor center for a recreation directly from the Flinstones - it's goofy but worth it.