By far the best shore dive site on the island. We keep looking for better ones, but keep coming back to Shark's Cove. The ease of entry, facilities, and the cave/lava tube network make it a blast to dive here. If you only get one dive on Oahu, make it Shark's Cove. The only drawback is that you can't dive it year-round, because the North Shore swell shuts it down for the winter.