The Kings Canyon rim walk starts with a 500 stair climb that is quite narrow and steep. Make sure you have plenty of water on this trek as I have already mentioned it is very hot and very exposed. Certainly no less than 2 litres each and maybe to be on the safe side 3. Also cover up! Not just sun screen but long sleeved top with high neck and hat. Sunglasses and good walking shoes. Probably best to start this walk as early as possible to beat the heat. The views are breathtaking and once at the top of the ridge walk is relatively easy going!! Truly a spectacular part of Australia.