People will soon be able to walk out "over" the Grand Canyon according to this National Geographic Article. The 1,500-member Hualapai indian tribe will soon open this attraction to generate revenues for the reservation. Not sure how much the walk out into the sky will run you, but it certainly looks cool. A large rendition of the project is available here.
I wonder what the length of the walkway is out from the cliff? The engineers I am sure worked to balance the load, strength and weight of materials to get you as far out there as possible.
How much would you pay for a ticket to do this? $0, $10, $15, $20?