Rabbit (Manana) Island is amazing. The far side is rough and the dropoff is sheer, deep blue. The Makapuu side is maybe 30-40ft and very clear; lots of turtles. The interior of the island is just withered grass with a few dead, bald coconut trees. Lots of ground nests/burrows. The island was apparently used for range practice from the Makapuu emplacements and spent .50cal bullets can be found everywhere on the shelf around the "nose". Mongo-sized opihi! Surfers occasionally make it out to the tail-end for some sessions. Several years ago, I went out on a kayak with a group who had secured permission to land -- packed along mask, fins, and snorkel of course.