just got my open water dive license and would love to check out some local hot spots!
Definitely get around the Giant Kelp Forests of Fortesque Bay where you will potentially find Weedy Sea Dragons, Seals, Sea Hares, and big Rays swimming through the 14m high kelp.
While you are down on the Peninsula you should cruise out from Pirates Bay (off Doo Town) and around to Waterfall Bay where the fish life is stunning, all within 15m. If you don't access to a boat you can drop in on Eaglehawk Dive Centre who can arrange small trips all around the area. If you are up for a shore dive then you can walk out from the beach at Tesselated Pavement. If you look straight out from along the left wall you will see a white breakwater out around one hundred metres. Just inside the massive boulder that is sticking out of the ground there is a small swim through with good fish life. Just stay away from the reef break :)
Heaps of options. There is also the wreck of the SS Nord but on your OW ticket you shouldn't be going under that far. The wreck, which is down further near Port Arthur, sits in sub 40m. Hope this helps. about 7 years ago