My Grandma took a trip to Mexico for a couple days. She went rappeling on 11 Zip Lines in Mexico going across 100 to 600 feet canyons that were 150 to 800 feet deep. NOT A TIME TO LOOK DOWN!!! Here are some pics.
I wouldn't have the guts!
This one is kind of a funny story. She and her group were supposed to get down to a big flat rock in the water for them to rest on, but when she got there she knocked into everyone and fell in the water.