Of course you do not need to be a diver to enjoy the charms of Apo Reef. Much of the reef lies in shallow water, and it may be the only place in the Philippines where even snorkelers stand a strong chance of seeing sharks. Also within the atoll-like reef system are picturesque islands that are mid-ocean pit stops for a variety of migrating seabirds, giving twitchers almost as much reason as divers to be excited about Apo Reef.