Underwater, Koh Phi Phi is sheer limestone pinnacles where fish gather, turtles drift past, and shy, harmless blacktip sharks patrol the shallows. Here's the honest version: the top dive sites for certified divers, the best snorkelling for non-divers, island-hopping boat tours, the clearest Andaman season, and how to choose a dive shop on safety — not just on price.
Koh Phi Phi (เกาะพีพี) is an Andaman island group in Krabi province, out in the sea between Phuket and Krabi/Ao Nang. There are two main islands: Ko Phi Phi Don (the inhabited one, with Tonsai village and the pier) and Ko Phi Phi Leh (uninhabited, day-trip only, home to Maya Bay). What the world knows Phi Phi for isn't only the sheer limestone cliffs above the waterline — it's the world below: submerged limestone pinnacles where fish school thickly, turtles, small harmless reef sharks, and the clear water of the Andaman side.
The good thing about Phi Phi is that it has something for both divers and non-divers. Certified divers can head out to pinnacles like Bida Nok and Bida Nai and the King Cruiser wreck, while anyone who has never dived can snorkel over coral and fish at Bamboo Island or Monkey Beach. We'll say it plainly from the start: Phi Phi is gorgeous, but it's also busy and boat-heavy, especially mid-morning when the day-trip crowd arrives all at once. If you want clear water and fewer people, a sunrise trip is the answer — worth knowing before you come, so you set your expectations right.
Around Koh Phi Phi there are snorkelling tours for non-divers, fun dives for the certified, and courses if you want to qualify. Prices are given as ranges because they shift with the year, season and shop.
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The easiest option for non-divers. A boat tour (speedboat or longtail) links several spots in one trip — Bamboo Island, Monkey Beach, the Maya Bay area, Loh Samah — over a half-day or full day. Snorkel gear is provided and some trips include lunch. It costs about ฿800–2,500 depending on the boat type and stops. A sunrise trip arrives ahead of the fleet, so the water is clearer and there are far fewer people.
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If you're already certified, just book fun dives on a dive shop's boat. These usually run as two-dive trips out to pinnacles like the Bida rocks and Shark Point, or further afield to the King Cruiser wreck. A trip costs around ฿2,500–4,500 (cheaper in a multi-dive package, and usually discounted if you bring your own full set of gear). Bring your certification card and logbook. Which sites you can do depends on your level and the sea conditions that day.
Want an internationally recognised dive certification you can use anywhere? The Open Water course takes about 3–4 days, split between theory, skills in shallow water, and several dives in the open sea. On Phi Phi it costs around ฿13,000–17,000, usually covering tuition, gear and the exam (more than the budget learn-to-dive islands on the Gulf side, because this isn't a cut-price training market). Ask clearly what is and isn't included, and choose a shop that puts safety first.
Never dived and want to find out if you like it? Discover Scuba Diving takes just half a day to a day: an instructor teaches the basics in shallow water, then takes you on a real, shallow sea dive under close supervision. You don't get a certification, but you get the genuine experience. It costs about ฿3,000–4,500, and if you enjoy it, many shops will credit it towards a full Open Water course. Tell your instructor honestly about any health issues before you get in.
There are several dive sites around Koh Phi Phi; these are the ones people talk about most — some suited to certified beginners, some you'll need experience or an Advanced certification for first.
A limestone pinnacle rising from the sea south of Phi Phi Leh, which many rate as the best dive site at Phi Phi. Its walls drop away sheer, drawing thick schools of fish, with a chance of turtles, leopard sharks resting on the sand, and sometimes blacktip sharks. Best for certified divers with a bit of experience.
A pinnacle paired with Bida Nok and close by, so dive trips often do both in a day. The highlights are its walls, soft coral, small swim-through caverns and fish schools, with a chance of turtles and blacktip sharks too. The current is gentle to moderate, and visibility is usually good in the dry season. Instructors like it for both training and fun dives.
A submerged reef known for blacktip reef sharks — shy and harmless to people — with frequent turtles, bright soft coral and sea anemones. (Don't confuse it with the other Shark Point near Phuket; the area has duplicate names.) It's an open-water site, best for certified divers with some experience. Watch the wildlife from a distance and never chase it.
A large car ferry that sank in 1997, lying in open water between Koh Phi Phi and Phuket. It's now an artificial reef swarming with fish, and one of the most popular wreck dives in the Andaman. It's a deep site and the current can be strong at times, so it's best for divers with an Advanced certification or solid experience. Trips often run from Phuket or Ao Nang rather than Phi Phi itself.
A submerged pinnacle near the King Cruiser, its top carpeted in sea anemones and full of clownfish and other reef fish, with a chance of larger species passing through to feed. It's an open-water site where the current can run, so it suits experienced divers, and it's often paired with the King Cruiser wreck on one trip.
The reef around Palong Bay and the shallower spots near Phi Phi Leh — shallow to moderate, gentle current, plenty of coral and fish. They're where instructors like to take students for their first dives, and they're snorkellable too, with a chance of small blacktip sharks in places. Good for beginners and anyone after an easy dive.
No certification, no course — just a mask and snorkel and you can see Phi Phi's underwater world. These are the best snorkelling spots.
A small island north of Phi Phi Don and the most popular snorkelling spot: fine white sand and shallow reef around it where you can see fish easily right off the water's edge. It's part of a national park, so there's an entry fee on arrival, and some years it closes for periods to let the reef recover. It gets busy by mid-morning — a sunrise trip means clearer water and fewer people.
A small cove on the west side of Phi Phi Don, reached by boat, with coral and fish close to shore that make for easy snorkelling — and a troop of macaques living on the beach, as the name suggests. Don't feed or approach the monkeys; they bite and snatch things. Keep food and bags zipped away. Most island boat tours stop here.
Loh Samah, on the back side of Phi Phi Leh near Maya Bay, has clear water and lots of fish and is a popular snorkelling spot. Pileh Lagoon is an emerald-green lagoon ringed by cliffs, beautiful for a swim and gentle snorkel. Both sit in sheltered bays, so the water is calmer than the open sea outside.
Mosquito Island (Ko Yung), a small island to the north, has shallow reef and fewer people than Bamboo Island, while Nui Bay, on Phi Phi Don, is a small, quiet cove with clear water for calm snorkelling. Both are on some island boat-tour routes — if you want to escape the crowds, ask whether your tour stops at these.
Maya Bay on Ko Phi Phi Leh is the image of Phi Phi, but after its reefs and marine life took a heavy battering, it was completely reorganised — you can visit, but you have to know the rules.
Maya Bay was closed for recovery from 2018 to 2022, then reopened with strict rules. These days you usually can't swim in the bay itself, and boats can't anchor in it. Visitors come in via a pontoon in the back bay and walk in along a boardwalk, with limited numbers and timed entry. Check the latest rules before you book.
As well as the daily rules, Maya Bay has periodic seasonal closures — some years it shuts around August–September to let nature recover — and no overnight stays are allowed on Phi Phi Leh. The dates and rules change every year, so before you buy a tour that advertises Maya Bay, ask clearly whether the bay is actually open during your dates.
There are plenty of dive shops around Phi Phi, Phuket and Ao Nang, and many are good, but the very cheapest can mean big groups or worn gear. This is a safety decision — choosing well is worth more than saving a few hundred baht.
Koh Phi Phi is on the Andaman side, so its season is the opposite of the Gulf islands — some months have much clearer water and calmer seas — and whenever you go, reef etiquette is something everyone needs to know.
The Andaman is best from around November to April — calm seas, clear water, the best underwater visibility, and all the tours running. It's the easiest time to reach far sites like the King Cruiser. March and April are very hot, and it's also the busiest stretch, so book tours and ferries ahead.
May to October is the Andaman monsoon — rougher seas and more rain. Some ferry crossings can be cancelled and underwater visibility is more variable. But on calm days you can still dive, with fewer people, and more sheltered sites often still run even when the open sea is up. If you come now, allow flexible days and check conditions with your shop.
The first rule of every dive: don't touch, hold or stand on the coral. Coral is a living thing — slow-growing and fragile, and even a touch or a fin kick can damage it. Phi Phi's reefs have taken heavy use, so control your buoyancy, keep your gear from dangling and dragging, and don't take anything from the sea. Just look.
Choose a reef-safe sunscreen that avoids chemicals known to harm coral, or wear a long-sleeve rash top instead. Don't feed the fish, don't chase or crowd turtles and sharks for a photo, and take every piece of rubbish back out with you. Good diving leaves as little trace as possible, so the next generation sees the same sea you did.
If you want to dive or snorkel in clear Andaman water, see sheer limestone both above and below the surface, and stand a chance of turtles and harmless sharks — Phi Phi is one of the most beautiful places in Thailand for exactly that. There's something for divers and non-divers alike, the dive sites are varied, and it's easy to reach from Phuket, Krabi or Koh Lanta (in high season).
But here's the truth: Phi Phi is very busy and very boat-heavy, especially mid-morning when the day-trips arrive together. Popular bays can be crowded and loud, and some reefs have taken heavy use. The way to enjoy it is to take a sunrise trip that beats the boat fleet, choose a smaller-boat tour with fewer people, and pick the quieter outer spots. Set your expectations there and you'll enjoy it far more.