Diving Koh Yao Yai: A quiet base for Andaman diving

Koh Yao Yai is a place to sleep on a quiet island and spend successive days reaching the recognised dive sites of the surrounding region by boat. Shark Point, Anemone Reef, Koh Doc Mai, the King Cruiser wreck and Phi Phi are the names that shape the itinerary. The island itself is less urbanised than Phuket, with beaches, rural roads and room for non-divers to enjoy the trip. It suits divers who prefer a settled base and flexible day excursions to a resort built entirely around diving.

This is predominantly boat diving, not a shore-diving holiday. Day boats leave Koh Yao Yai for Shark Point, Anemone Reef, Koh Doc Mai, King Cruiser and Phi Phi, so the character of each day depends on the run, the sea and the site selected. The King Cruiser is the clear wreck option, with greater depth and conditions suited to advanced divers. Elsewhere, the sites cover a wider range of experience, although currents are variable rather than negligible. Visibility is commonly described within a broad ten to thirty metres, changing with rain, wind, swell and runoff. Expect a proper day on the water, with travelling, entries, several dives where offered, surface intervals and a return crossing, rather than a quick dip from the hotel beach. A drift dive may be part of the day when current and site planning make it appropriate.

The marine-life experience here is tied to the character of the reef sites and the wreck rather than to a dependable wildlife calendar. Shark Point and Anemone Reef provide the reef-focused names on the itinerary, while King Cruiser changes the setting to a submerged wreck and Phi Phi adds island scenery above and below the surface. Koh Doc Mai belongs to the same regional day-boat pattern. Conditions can alter both the visibility and the time spent observing a site, particularly when rain, swell or current affects the plan. There is no reason to build the trip around a promised seasonal animal encounter. Come prepared to spend time looking closely at the underwater setting and accept that what appears on a given day will be opportunistic.

The sensible window is November through April, when the sea is generally calmer and longer boat trips are more workable. Visibility is usually more favourable during these months, although it can still change with wind, rainfall, swell and runoff. From May to October, the monsoon brings a greater chance of rain, stronger wind and rougher water. Those conditions can increase current, reduce visibility and make the more distant itineraries less dependable. Koh Yao Yai may remain pleasantly quiet in the rainy season, but that does not make the surrounding sites easier to reach. Keep flexibility in the programme, especially if Phi Phi or King Cruiser is central to the holiday.

The destination can work for beginners because local outings cover different levels, but the current and depth must be matched to the individual site. An Advanced Open Water qualification is useful for deeper dives, particularly King Cruiser, which is regarded as an advanced dive. BSAC, PADI and SSI divers should confirm the planned depth, current and wreck requirements before booking. Experience with boat diving is more relevant here than confidence based only on easy shore entries.

From London Heathrow, Gatwick or Manchester, travel first to Phuket or Krabi, then continue overland to Bang Rong Pier in north-east Phuket or to Ao Thalane near Krabi. Koh Yao Yai has no airport, so the final leg is compulsory by ferry, speedboat or longtail boat. From Phuket, the crossing is roughly thirty to forty minutes, depending on the boat. The public service from Ao Thalane takes about an hour on the water. Allow generous time between the flight, road transfer and last sailing, since piers and timetables vary with season and weather. Once on the island, accommodation and dive centres are spread out, so arrange a centre shuttle or road transfer rather than assuming you can walk.

Treat Koh Yao Yai as a base for regional diving, not as a beach-diving destination. Book several possible boat days instead of fixing every dive in advance, because Phi Phi, Shark Point, Anemone Reef and King Cruiser all depend on sea conditions and boat availability. Ask for an early departure or a smaller group if you want to reduce time mixed with the day boats at the better-known sites. Keep one spare day before an international flight: the return involves a sea crossing followed by a road journey to Phuket or Krabi. Do not mistake the island’s quiet roads for quiet water, since popular sites can still be busy. Compare Phuket and Krabi access if your flights allow it, and carry rain protection and seasickness medication for long crossings. In the rainy season, avoid building the whole holiday around distant sites that may become impractical in swell.

Seven to ten days gives the trip a sensible rhythm: several boat days, reserve time for weather, and days to see the island or Phang Nga Bay. Accommodation is spread around Koh Yao Yai, so plan road transfers or use a dive-centre shuttle. Non-divers have beaches, rural villages and roads to explore by scooter, bicycle or local transport, plus boat trips, kayaking and snorkelling when the sea permits. Leave room for rest between diving days and for a slower look at the island itself.