For the most part, you are very safe on the Hawaiian Islands from all animal and plant life. There are no large predators or snakes, and there are few plants that will irritate when hiking (no poison oak or ivy, for example).
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Tiger sharks are the most wide-ranging top reef predator in Monument waters, routinely swimming hundreds of kilometers along the Hawaiian Archipelago and out into open ocean. Grey reef and galapagos sharks occasionally cross open ocean between islands but are generally resident at a single island.
Large mammalian carnivores are often absent on islands because of insufficient range or difficulties in over-water dispersal. In their absence, the ecological niches for large predators may be occupied by birds, reptiles or smaller carnivorans, which can then grow to larger-than-normal size.
There are about forty species of sharks that occur in Hawaiian waters, ranging in size from the deep-water pygmy shark (about 8 inches) to the whale shark (up to 50 feet or more). About eight species are somewhat common in nearshore waters.
Since Hawaii has a steady climate, the deer reproduce year-round. Axis deer will eat almost any plant, destroying crops and endangered plants. Axis deer season in the Hawaiian Islands differs depending on which Island you would like to hunt. On Lanai, axis deer season begins in mid-February and runs through mid-May.