Caution was spot on, it's Lucky Bay.
Great spot, relatively easy to get to. The sand is pretty hungry by the middle of summer but I managed to drag my 5m tinny in with my Navara so it can't be that bad.
It's only a bit over an hour north of Gero and because it's such a nice spot don't bother going there at easter because you won't get a camping spot.
I've kited there, as you can tell from Google Earth it's only 200m across and with the howling southerlys you get you can cross that pretty quickly. The water drops off pretty quickly, probably 6ft deep for the most part within 5m of shore, drops down to 4-5m deep in the middle and comes up again as you get close to the reef.
But yeah, nice flat water when its blowing, good fishing outside the reef for mackies as well as your bottom stuff when there's no wind and all in all a great little camping spot if you can shelter behind a dune when the winds up.
Oh yeah...stay away! It's my spot!