The Kings Canyon Rim Walk is an absolute must to do, if your body is in the condition to do so.
It’s a very demanding 6 km round trip that’s got a steep climb at the beginning but everyone that undertakes it says that’s it one of the best things to do whilst you are in Central Australia (maplink). Expect to take 3 to 4 hours to complete the walk and take plenty of water.
I took over 300 photos as I was so overawed with the whole place. I have cut them back to 65 (which is still too many) but I hope you can get through them all; Neil.