Shrike, I checked with a local and Raymond Island is already inhabited by a helicopter and an aircraft on its own strip, as well as the birds and Koalas.
The question is what is "reasonable", a previous poster has stated that "reasonable" is 10 to 20 movements a day in NSW. My definition would be about 4 to 6. As for circuits and low flying, I agree, either invite the neighbours for a joy ride or don't do it.
The other issue is that "loss of amenity" cuts both ways. A little Rotax noise for a few minutes weighs up pretty well to avoiding a Five hour drive from Melbourne.