I am down there the weekend (5days) before also, so it would mean flying back down to Barnbougle 4 days later for another 3 days - sounds pretty good, but not sure if I would still have a family to come back to... I can be emergency.
I live on the Bellarine Peninsula, my home club is 13th Beach:
http://www.13thbeach.net/ - 36 holes - am happy to host anyone that is interested. Barwon Heads GC:
http://www.bhgc.com.au is next door, and has some really interesting o/n acc - a bit like Fawlty Towers. Most enjoyable, jacket and tie after 6pm. Also great stay & play rates with Full board.
I would also recommend staying at Victoria GC on the Sandbelt:
http://www.victoriagolf.com.au - excellent experience, golf & stay packages are very good, and the course is hosting the Australian Masters in November - so should be good. FULL Board, golf and acc currently house guest at A$265 twin share. that is breakfast, lunch, dinner, golf acc for $265!
I will second the things to do nearby Bridport - there are many excellent wineries and tasting rooms. At that time of the year it can still be quite hot and there are tons of beachs around, including the beautiful one at Barnbougle. The will be a day spa set up by then, giving the girls time to amuse themselves. Hobart and Launceston have some interesting historical things to do, particularly Hobart, with it's links to colonial times and convicts.
Ratho GL at Bothwell would also worth a visit:
http://rathogolf.com/ with a claim to Australia's oldest golf course and the oldest outside Scotland.