My dog always seems to need to go at the prettiest of places - the Great Australian Bight, looking out to sea - that sort of thing - never failed to make us giggle!
While my favourite human bush dunnies are not coming to mind just now - i do have a couple of points that may be of interest
1. be careful which latch you use on the Kitchen Hut dunny - i was locked in for what seemed like hours (was probably 5 minutes) madly trying to get the latch undone...
2. pooing on the walking path is a big no no - i found a human turd complete with toilet paper smack bang in the middle of the steep track down from Marions Lookout to the Dove Lake circuit. Yes - it was winter, it was cold and there were not too many people around - but gees - this was really unnecesary and disgusting
Wherever you toilet - be mindful of other track/camp users and....enjoy the view
of a cast iron "Pissoir" in a bushy part of Brisbane's Albert Park in about 1970. The shape has a resonance of the corrugated iron Parsons Track dunny above. Perhaps one of these industrial revolution masterpieces could be helicoptered into a remote location to be pondered on by the occasional bushwalker as did the apes in 2001 A Space Odyssey marvel over the "slab" from the past/future. 
