How bad is this for people who don't like heights? I did the skywalk at the grand canyon, which I wasn't thrilled with but I did alright. I don't mind going up in closed in cable cars. However when I visited the great wall they sent me up in an open ski lift chair with just a bar and nobody else was on the thing. That was a bit too intense for me. Somehow it makes a difference from being in an enclosed cable car vs a small ski lift seat.