New Caledonia is fairly safe, but it is wise to take the following precautions:
When snorkelling, avoid contact with sea urchins, which are often poisonous, and coral structures, which can cause scrapes that swell badly and take a long time to heal.
A sea snake known locally as the Tricot Rayé has a potentially lethal venom, but is not aggressive when left alone, and only attacks when threatened.
There are sharks, some of them quite large, though Great White Sharks are rare. Avoid shark attacks by: Not carrying fish that you have caught and may be bleeding while in the water Facing the shark, so that to the shark you appear large, vertical and difficult to bite
There are no crocodiles native to New Caledonia. Rogue individuals have been observed on the island no more than twice within the past 200 years, probably swept out from the Solomon Islands.