There's a thread Dogs in national parks
viewtopic.php?f=5&t=24032
Part of that thread dealt with the legality of taking pictures in public places, which is a separate issue. Hence, I've started this thread.
See
http://4020.net/words/photorights.php
"In Australia the taking and publication of a person's photograph, without their consent or knowledge but within the limitations outlined below, is not an invasion of privacy, nor is it in contravention of case or statute law."
There's links to a number of places, including one about national parks
http://www.onlineopinion.com.au/view.asp?article=410
I'm unaware of any adverse or inappropriate incidents due to taking pictures in parks. Certainly some discretion is needed when children are present, if people are swimming, or if there's a reasonable expectation of privacy. There may be other categories.