gday Bruce - yes I just saw it is going to cost nearly $800 for the ferry to KI. Where do you stay in Robe are?
Apparently its $$$$ on Kanga as well

Big Bob from the club was going to go there once before and pulled out due to $

When we go to Robe, we stay at this joint - walking distance from pub.
Beachport Southern Ocean Tourist Park
Somerville St, Beachport SA 5280
Phone:(08) 8735 8153
As you come into Beachport, on the left is the tourist joint, go in there for some maps, they have awesome maps of the 4b trips round the dunes and Shit. Then go to T intersection, pub is infront of you, turn left, theres a servo down there, then take first right and you are heading to the van park.
Its central to Robe one direction, and Carpenters Rocks the other if you wanna do a couple of day trips along the beaches - check the tides, and be VERY VERY careful on the beaches.
You can also do
Narracoorte Caves another day from there..
Do it mate, its a good trip.