A week ago my partner and I did the Bruny Wildlife Adventure with Hobart Cruises. It was awesome. The highlight was defiantly seeing seals both on the rocks and in the water under the boat. The boat had this underwater submarine thing with a camera on it - it was out of this world.
The guide on the tour was both nice and informative. He gave us warm jackets (mine reached the floor!), beanies and even hand warmers. The skippers (you go on two different boats during the day) seemed very professional and knew the area very well. Both boats were All in all we were well looked after and had a great experience. Definitely a must when in Tassie!