I would love to go, even if it killed me. (Keep in mind that I'm already old, so my bravado is almost irrelevant). I loved hiking when I was younger and would give anything to be able to walk that huge canyon on Mars from end to end. It is 2500 miles long, and 6 miles deep in places. It must be incredible.
I'd have to carry a lot of trail food. But it would weigh less! Hooray!
EDIT: Forgot. Thanks for the link, mrbiscoop!