Hi Bryan,
I just moved to Sandringham, about 30 min west of you. In Mulgrave you are 45 min drive from the Mt. Martha dark sky site of MPAS in Briar's Historic Park(
http://www.mpas.websyte.com.au).
Southern and western sky are fairly dark from this site.
then there is the ASV's dark sky site at Heathcote
and Snake Valley club's site west of there, and a few others.
PM me if you like, or perhaps attend the next MPAS general meeting. after you join you can get a quick orientation to the site then you are good to go.
Scott