I'd say Tassie.
Just got back from Coles Bay - Freycinet National Park - absolutely bloody beautiful. A watersports haven. My son described it as a cold Hawaii, which is not far off the mark. White sands, turquoise water, largish mountains, plenty of untamed wilderness, delicious food, great surfing, fishing.
This time of year the weather is perfect and you can even catch the ferry as we did with the car and bring all your own stuff.
There's a guy who hops on the SUP forum sometimes, Kyron, who posts some beautiful vids of his times in Tassie.
Here we go - enjoy.