Coastal is good, eg Merimbula upwards, but you'll be prone to storms at this time of the year later in the day. If you'd be flying most days before lunch you'll probably have no dramas.
Inland is good if you like the outback and not really that far flying, eg. Broken Hill, Marree, Birdsville upwards if that interests you but very hot (less humid of course) and rather bumpy at most times of the day.
Perhaps over to Adelaide, back most of the way, over to King Island from Cape Otway, over to Tassie and back via Flinders Island, back up to Merimbula. Hopefully there might be some accommodation around at this time of year unless you are tenting it.