El Nido Tour D focuses on the coral reefs surrounding Cadlao Island in the Philippines. This snorkel-specific itinerary features limestone formations rising above the water and provides access to local reef environments. The site is suitable for beginners, with mild currents and water temperatures ranging from 27C to 31C throughout the year. Access to these sites is exclusively by boat, and visitors typically explore the area via guided tours. The experience is defined by the topography of the island and the surrounding marine reef structures.

Zimisu is a reef and wall site located in El Nido, Philippines, offering a depth range of 9 to 20 metres with an average of 15 metres. The topography features a wall structure that allows divers to practise buoyancy control and wall techniques. Conditions are generally manageable with mild currents and visibility ranging from 10 to 30 metres. Water temperatures remain consistent between 27 and 30 degrees Celsius year-round. Access to this site requires a boat trip from El Nido. Due to the depth and wall environment, this site is best suited for intermediate divers.

Dilumacad in El Nido features a combination of reef and cavern topography ranging from 5 to 30 metres in depth. The site is best suited for intermediate divers who can navigate both shallow reef structures and the deeper cavern section. Visibility is variable, ranging from 3 to 30 metres, and mild currents generally prevail. Water temperatures remain consistent between 26 and 30 degrees Celsius throughout the year. Access to this site is exclusively by boat, located 6000 metres from the shore. Divers are advised to carry a torch for the cavern, as natural light levels decrease rapidly within the structure.

Cadlao Lagoon Mouth in El Nido, Philippines, is a reef site accessible by both shore and boat. Located 6000 metres from the shore, the site features limestone cliffs and offers depths ranging from 1 to 8 metres, with an average depth of 4 metres. Snorkellers can expect mild currents and visibility between 10 and 30 metres. The water temperature fluctuates between 27C and 31C throughout the year. The site is suitable for beginners, though caution is advised regarding sharp coral. A typical snorkel session lasts approximately 60 minutes.

Cadlao Tip is a reef dive located off Cadlao Island near El Nido. The site features a reef slope extending from the surface to a maximum depth of 25 metres, making it suitable for divers of varying experience levels. Access is exclusively by boat, requiring arrangements through an El Nido dive operator. Conditions are generally comfortable with mild currents and visibility ranging from 10 to 30 metres. Water temperatures remain between 27 and 30 degrees Celsius throughout the year. Divers should aim for morning dives to maximise light penetration for observing the reef structure and detail.

Helicopter Island in El Nido features an extensive coral garden on its southeastern side, beginning just metres from the beach. The site offers a mix of hard and soft corals, transitioning into a sudden drop-off that leads into deeper water. Depths range from 5 to 30 metres, with visibility typically between 10 and 30 metres. Conditions are generally mild, making this a suitable location for beginners. Access is available via both shore and boat entries. Water temperatures fluctuate between 27C and 31C throughout the year.

Dilumacad Island, also known as Helicopter Island, features a diverse topography consisting of a southern reef, a central sandy patch, and a northern reef. This marine site offers depths ranging from 5 to 30 metres and includes cave and cavern formations, presenting an overhead environment hazard. Accessible only by boat, the site is suitable for beginners and supports night diving. Visibility varies significantly from 3 to 30 metres, while currents remain mild. Water temperatures typically range between 26 and 30 degrees Celsius throughout the year. The site is located approximately 6000 metres from the shore.

West Entalula is a boat-access wall and drop-off site located near El Nido. The topography features a reef structure that descends from a shallow 3 metres to a maximum depth of 35 metres, with an average depth of 20 metres. Visibility is variable, ranging between 5 and 30 metres. While currents are typically mild, they can increase in strength, requiring divers to remain aware of their position relative to the wall. Due to the risk of entanglement around overhangs and reef structures, all equipment should be secured before entry. This site is suited for intermediate divers, with a typical dive duration of 45 minutes.