From township of Wonthaggi take Cameron Street (becomes Berry's road) you'll drive past a footy ground, then a cemetary (both on right), then the road becomes gravel, at the bottom turn right and drive until you hit the carpark, then it's a 500m walk across the dunes to the beach. But if you can't find Harmers Haven specifically, most of this coastline is worthwhile (keep an eye open for crays as well).
Hope this helps
Jaz
Hope this helps
Jaz