This post may only be of passing interest if you are keen on death to rabbits.
Rodd Island was originally used as a research station for studying the use of chicken cholera to kill rabbits. I ride past it everytime I go around the Bay, and I finally stopped this week to read a plaque on the foreshore that tells you some useless information that can be trotted out at dinner parties.
I'm not sure how deep the water is out there. You could probably walk halfway to it at low tide.