#1 Cache its on dry land and in a remote but populated part of the island.
In a Tupperware like plastic container which I painted camo to help conceal it.
Hidden in a rock crevice, just large enough for container, and 2 rocks covering opening.
#2 Requires SCUBA gear to reach. DO NOT attempt if you are not a certified diver.
Cache is 2 laminated sheets with the cache info printed on it.