We did Tasmania this year and loved it, but we went down the west side. We also started in the north and left from the south, but we had about six days. We stayed at a cabin in the Northwest and saw a tasmania devil come right up to our door. Also we loved cradle mountain and seeing all the wombats roaming around. The river cruise on the west side was also a highlight. I'm not sure I can recommend what's best for you since it's a lot of driving to get to many of the places on the west coast, but I loved it. We also did Maria Island and enjoyed it and there are Wombats and all kinds of Australian wildlife there. You can easily see platypuses during the day at the Tasmanian Arboretum on the north part of the island.