To see the best of Kangaroo Island by water would take several weeks - and a lifetime to really get to know. However seven of my workmates made a serious effort last weekend, sailing 188 nautical miles in 4 days, but still stopping frequently with ample time for beach bonfires and cappuccinos. I've found that the trick is to start at Wirrina and sail as far west as you can on your first day (weather allowing).
Full write-up:
blog.arribasail.com/2017/02/cruise-arriba-charity-cruise-2017.html

Tuna are being caught in Backstairs Passage (although we missed out). The South Coast is of course always better for tuna. A friend just caught several approx. 2 miles S/SW of the Cape Willoughby lighthouse.