I would do it, but I'd probably cry and/or crawl. I'm terrified of heights, I was probably most scared in the Washington Monument, it felt like it was swaying. I remember having to sit down one time, I think it was the Space Needle in Seattle. But, I've been 13,500 feet up when I went skydiving and didn't die, so I'm sure I'd be fine in this Grand Canyon tour. But, I'm sure I'd cry for awhile.