I don't think anyone mentioned Thumb Rock, a dive site on the NW side of Great Camanoe. It is possible to swim between the two.

There is also a pinnacle that goes maybe 15 or 20' above the surface in the S end of Lee Bay on Camanoe. Not sure if it has a name.

And Liane, thanks for answering my query and giving Black Rock a name. I knew that, but too much Mt. Gay over the years!