Hon. Robyn Parker MP, Minister for Environment and Heritage firstname.lastname@example.org.
You can find the list of affected National Parks and Reserves here. http://www.wires.org.au/component/content/article/258.html
You can find the list of National park estate land that cannot be declared as public hunting land on page 11 of this document. There are only 20 so it won't take you long to read it.