Hope your not both scared of heights. Its a long climb and the path is very narrow in some places - my wife made it up about 50 meters. That as high as she goes without a plane :p
If your are driving to Kings Canyon think about taking the Mereenie Loop back from Kings Canyon to Alice Springs - nice light in the afternoon with the sun reflecting off the West McDonald Ranges as you drive along the base of the range for quite some time. Beautiful drive.

