Nope I wouldn't, just looking at that first picture is making my legs turn to jelly ... I wouldn't go walking on the rock either, but I have walked across this near my daughters' home in Spain... even tho' I'm afraid of heights ....go me!!!
I would probably walk across a foot bridge as long as it had sturdy railings and didn't sway. I'd try the huge rock but it would have to be very wide and I'd never dangle my legs at the tip of the rock.