Marcus, there is no such thing as an uninteresting road in Tassie, and any route that you choose will be fantastic. Your chosen route has covered the east coast, Hobart and environs, Strahan, Cradle Mountain, and Stanley on the north coast, so you've nailed the highlights. Hobart to Port Arthur is one of the most scenic roads in Tassie. I've ridden all of these roads several times over three trips to Tassie, and the're all great. Chris and I will be back there again on the ST in the coming Dec-Jan, riding with three other couples. The only ride that I would add if time permits, would be the run from Hobart to Strathgordon and back again. It's about a 300km round trip, and well worth doing, but avoid it if the forecast is for rain.