'Sydney Haulage Terminal', Bellevue St., off Princes H'way at Sydenham, will get you right up next to the fence, RWY 16R, on short final.
Just across the Cooks R. tributary that 'flows' into the main river, from the actual threshold.
It used to be OK in the 'old days' for access. Don't know about these days, but you could explore it.
Cheers
