I am currently touring the Tasmania east coast in our old Triumph sports car. That is not relevant to a sailing forum but explains why I am here.
The east coast is really beautiful as is the Tamar River area. I can see a future cruise down here, maybe for a Hobart Wooden Boat Festival (I know the S&S34 doesn't really qualify but is a suitable vehicle to get there in).
Crystal clear water, nice little towns with good anchorages, great scenery. The water is decidedly cool (bloody cold really) but it is a minor compromise and might be a bit warmer in January/February.