Some things you will want to take.
Swim shorts. There are lots of little lakes and ponds, and the ocean. Lots of extra dry clothes. it gets pretty wet here. Rock wall gear. Lots of mountains. Camera. Very pretty island. lots of cool wildlife on the island as well.
Sunscreen and beach supplies. There are a lot of beaches here so these are a must have.
You will want to rent a car here so you can drive to the mountains.
Parrots. Very pretty birds found all over the island
Seals. Asleep most of the time. found on most beaches on the island
A ton of wild chickens everywhere. cannot go anywhere on the island without seeing one.
Small lizards and snakes. mostly in the forest.
Any seafood with steak. Fresh seafood of all kinds. The best restaruant to go to get this is called TidePools. it is on the south side of the island. It has a 4.5 out of 5 rating. the average meal costs about $30.
Chocolate covered macadamia nuts. An island special.
Boar from a famous traditional hawaii loual. Most famous thing on the island. A must try meal while there.