Apo Reef National Park (Sablayan) - Dubbed as the country's diving mecca, this 3-kilometer reef has a narrow channel dividing the reef into two lagoon systems. Beneath the clear water of these lagoons, divers can explore the white sandy bottom with its colorful array of some 500 coral species. Almost 500 marine species, including a variety of sharks, sting rays and manta rays, can also be spotted around the area. Bird-watchers can visit the fascinating bird-populated island of Binangaan and Cajos del Bajo.