There are a couple 4wd tracks around that i know of mate, but not many. The gladstone blokes are coming up next week to go to five rocks, but i have to head to gladstone that weekend. Up behind Qmag there is a short stretch between boundary Rd and william polfrey drive, which if you turn off there is heaps of tracks around the water reservoir...private property i believe so be warned though.
EDIT: the road is legal, it is if you turn off it and go into the property the reservoir is on that you then trespass