Koh Rok is the most popular day trip from Koh Lanta, and for good reason. The two islands, Koh Rok Nai and Koh Rok Nok, sit in Mu Koh Lanta National Park south-west of Lanta, separated by a narrow channel of clear, shallow water over coral. White beaches, forest behind the sand and reef a few strokes from shore make it one of the best snorkelling spots on Thailand’s Andaman coast.
Most tours combine the trip with Koh Haa, a group of small limestone islands with deep, clear water. This guide explains what you see, how a typical day works, what to bring, the park rules and how to book a good tour.
In short: a Koh Rok tour is a full-day speedboat trip from Koh Lanta, usually with Koh Haa, two or three snorkel stops, lunch on the beach and hotel pickup. It runs in the dry season (roughly November–April). GetYourGuide listed around 20 Koh Rok options on 13 November 2026.
- Departs
- Koh Lanta (hotel pickup)
- Boat
- Speedboat
- Duration
- Full day
- Season
- Approx. Nov–Apr
- Park
- Mu Koh Lanta NP
Compare Koh Rok tours
Speedboat snorkel days from Koh Lanta with pickup, lunch and reviews.
Koh Rok and Koh Haa: What You See
Koh Rok Nai and Koh Rok Nok
The two islands face each other across a shallow channel. The reef in the channel and along the beaches is the main snorkelling area: expect hard and soft corals, parrotfish, angelfish and other reef species in calm conditions. The beach on the outer island is the usual lunch stop, with a ranger station and shade. Monitor lizards are often seen near the forest edge.
Koh Haa
Koh Haa means “five islands”. The steep limestone islands rise from deeper water, which gives very good visibility in the dry season. Snorkellers stay at the shallow edges; divers explore the walls, swim-throughs and the famous “Chimney” and lagoon areas. Many tours stop here first or last.
A Typical Koh Rok Day
| Time | What happens |
|---|---|
| 07:30–08:30 | Hotel pickup on Koh Lanta |
| 08:30–09:00 | Speedboat leaves the pier |
| Late morning | Koh Haa snorkel stop |
| Midday | Koh Rok: snorkelling, then lunch on the beach |
| Afternoon | Second Koh Rok snorkel stop or beach time |
| Mid-afternoon | Return to Koh Lanta and hotel drop-off |
Times vary by operator and sea conditions. The speedboat crossing can be bumpy; sit towards the back if you are prone to seasickness.
Compare Koh Rok Tours
GetYourGuide returned around 20 options for Koh Rok from Koh Lanta on 13 November 2026, including small-group speedboats and combined island days. Compare group size, pickup areas and inclusions.
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What Is Usually Included
- Hotel pickup and drop-off on Koh Lanta.
- Speedboat transfers and a guide.
- Snorkel mask and snorkel, sometimes fins.
- Lunch on the beach, drinking water and fruit.
- Life jackets.
Park fees
Koh Rok and Koh Haa are inside Mu Koh Lanta National Park, which charges an entrance fee to foreign visitors. Some tours include it; others collect it in cash. Check before booking.
When Can You Visit Koh Rok?
Tours to Koh Rok run mainly in the dry season, roughly November to April, when the sea is calm and visibility is best. The national park may close the islands for part of the monsoon season, and boats do not run when the sea is rough. If your dates fall in the shoulder months, keep a spare day in case of cancellation.
Snorkelling Tips for Koh Rok
- Wear a rash vest or lycra suit for sun protection.
- Use reef-safe sunscreen and apply it well before swimming.
- Never stand on coral; float or fin gently in shallow areas.
- Stay with your group and within the area the guide shows.
- Use a life jacket or float if you are not a confident swimmer.
Snorkelling here is easy in calm conditions, but currents can pick up in the channel. Follow the crew’s instructions.
Diving at Koh Haa and Koh Rok
Koh Haa is one of the main dive sites for beginners and experienced divers from Koh Lanta, and the Rok islands have easy shallow dives. If diving is your priority, book a dive trip rather than a snorkel tour: see Koh Lanta diving.
Private Koh Rok Trips
A private speedboat lets you leave early and reach the reef before the tour boats. It is expensive but can be shared by a group. Agree the itinerary, timing and park fee in advance.
Marine Life You Might See
| Animal | Where | Notes |
|---|---|---|
| Parrotfish and angelfish | Shallow reef in the channel | Common in calm, clear water |
| Clownfish | Anemones along the reef edge | Look but do not touch |
| Giant clams | Reef flats | Protected; keep your distance |
| Turtles | Occasionally around the islands | Sightings are a bonus, not a guarantee |
| Blacktip reef sharks | Shallows near the beaches | Shy and harmless to people |
| Monitor lizards | Forest edge on the beach | Do not feed them |
Visibility and wildlife depend on the season, the weather and the tide. On a calm day in the middle of the dry season, the shallow reef can be spectacular; after storms, the water may be cloudier.
With Children
Older children who can swim usually love the day: the beach is calm, the reef is close and the speedboat is exciting. For younger children, the long crossing and full day can be tiring. Bring snacks, a hat, a rash vest and a life jacket that fits, and choose a calm day. Some families prefer a shorter 4 Islands day from Lanta instead.
What to Pack
- Swimwear, rash vest and a towel
- Reef-safe sunscreen, sunglasses and a hat
- Water shoes for the beach and boat steps
- A dry bag for your phone and cash
- Motion-sickness tablets for the speedboat
- Cash for park fees, drinks and tips
- A waterproof camera or phone case
Choosing a Good Operator
Look for small group sizes, recent reviews that mention safety briefings and punctuality, and clear information about what is included. Good crews keep snorkellers within sight, provide life jackets in all sizes and explain how to protect the reef. Free cancellation is valuable in the shoulder months when the sea can turn rough.
Shared or private?
Shared speedboats are the most affordable option and run daily in the season. Private charters cost more but let you set the timing, which can mean the reef to yourself early in the morning.
Combine With Other Trips
After the Rok day, many visitors add the 4 Islands trip to the Trang islands and the Emerald Cave, a mangrove kayak on Lanta’s east coast, or a dive at Koh Haa. See things to do in Koh Lanta for more ideas.
About Mu Koh Lanta National Park
The national park was established in 1990 to protect the southern tip of Lanta Yai and a group of islands to the south and west. Its marine area includes coral reefs, seagrass and the waters around the outer islands. Park rangers manage visitor numbers, collect fees and can close sites to let reefs recover after storms or bleaching events. The park headquarters and lighthouse viewpoint are at the southern end of Lanta, and are worth a visit on a separate day.
Visiting with an operator who respects park rules helps fund protection and keeps the reefs healthy for future visitors.
Avoiding Seasickness on the Speedboat
The open-sea crossing is the hardest part of the day for some people. Take a tablet 30 to 60 minutes before departure, eat a light breakfast, sit towards the back of the boat where the motion is gentler, and keep your eyes on the horizon. Fresh air helps, so avoid sitting in an enclosed cabin. If you are very prone to seasickness, choose a calm day early in the dry season, when the sea is usually at its flattest.
Koh Rok: FAQ
Is Koh Rok worth it?
Yes. It is the best snorkelling day trip from Koh Lanta, with clear water and reef close to shore.
How long is the boat to Koh Rok?
By speedboat, roughly an hour or so from Koh Lanta, depending on the sea.
Can you stay overnight on Koh Rok?
Overnight stays are subject to national park rules and facilities; check with the park before planning one.
Can non-swimmers go to Koh Rok?
Yes, with a life jacket; the beach and shallow areas are fine in calm conditions.
Sources: Mu Ko Lanta National Park (Wikipedia) and GetYourGuide listings, checked on 13 November 2026.
Photos: dronepicr (CC BY 2.0, Wikimedia Commons); Thomas Quine (CC BY-SA 2.0, Wikimedia Commons); Krzysztof Golik (CC BY-SA 4.0, Wikimedia Commons); Hanumanix at English Wikipedia (Public domain, Wikimedia Commons).
Disclosure: InsideSamui may earn a commission when you book through some of the links on this page, at no extra cost to you. Prices and timetables quoted here were checked on 13 November 2026; they change by season and operator, so confirm when you book.