HEY THERE
We spent a week there last year and found all but 2 on the whole island. One was no longer there and the other we would have had to rent a kayak to get to it and we didnt have enough time by the end of the week to do it. If you look up my name you can add me as a friend and look up all of the caches on the island on my site so it will give you an idea where to start.