there's lots of crocs: at the leeside of the island, at the southend in the mangroves,at the other side of the split.... as long as you swim at daytime, there's no problem. But after the sun goes down you better not go near the mangroves, because I've seen the result of a croc bite. It was a small one, but still....
And the split or several docks at the south end of CC are perfect spots for snorkeling for which you don't need a boat