Only being 170ks from Lake Gairdner means a quick trip when its on is easy. As a spectator, one day maybe two at the most is enough. It definitely gets you thinking about what you could build but as Firko said its not that easy. The range of machinery there is amazing and to walk around the pits is truly educational. Theres not a lot to see when it comes to the speed side of things but certainly the tunes coming from the vehicles is sweet, listening to Rod Hadfields Bronzed Aussie [commodore] at full flight makes the ears prick up.
A tarp, shade, sun screen, hat and plenty of liquid a must. The tarp is requires to put underneath your vehicle incase of oil leaks etc. Most people use tek screws for shades and tarps.
Its well worth the effort and the journey is all part of it.
It pays to go early in the week while most of the vehicles are still in one piece.