The Grand Canyon challenge was to celebrate the 2,687 miles (driving distance) I have walked from my home east of Toronto to San Francisco, over a period of two years. Not bad for an old fart age 70. Couldn't find a Golden Gate challenge anywhere, but Grand Canyon was a wonderful alternative. I'm currently doing Pacer's 100-mile Chichen Itza challenge, to celebrate my approach into Acapulco (2,832 miles). Fascinating checkpoints. I'm just 20 miles away. By the time I'm 80, I may even make ...