Hiking along the canyon was great. I'd love to return and do the bike ride along the canyon. Even if it triggered my fear of heights, I still enjoyed it.
After the Grand Canyon, we visited one of those drive-in nature preserves, like the one near Mount Rushmore. This one was Bearizona, and it had the most active bear cubs I've ever seen. Two of them wrestled with each other, nonstop. I'll try to get the video footage of the bear cub wrestling online.
After that, I learned never to let my sister drive to Los Angeles at night. That was it for the day.