The 4 Islands Tour is hands down the most popular day trip from Koh Lanta. Swimming through the dark cave passage to reach a hidden lagoon, snorkeling above colorful reefs, and lounging on powder-white beaches — all in one day. If you’re on Koh Lanta, this is the experience you can’t miss.
What Are the 4 Islands?
The tour visits four stunning spots in the Andaman Sea, each offering something unique:
Koh Mook (Emerald Cave) — The star of the show. You’ll swim through a 80-meter dark cave tunnel (don’t worry, guides have flashlights!) and emerge into a hidden lagoon surrounded by towering limestone cliffs. It’s like discovering a secret world.
Koh Ngai — A pristine beach paradise with crystal-clear water. This is where most tours stop for lunch and beach time. The snorkeling here is excellent — expect to see clownfish, parrotfish, and if you’re lucky, sea turtles.
Koh Chuak — A tiny uninhabited island perfect for snorkeling. The coral reefs here are healthy and teeming with tropical fish. Less crowded than other spots.
Koh Kradan — Often called one of Thailand’s most beautiful beaches. White sand meets turquoise water in the most photogenic way possible.
Activities on Koh Lanta
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Longtail vs Speedboat: Which to Choose?
Longtail Boat (฿800-1,200)
- More authentic Thai experience
- Slower, more relaxed pace
- Better for photos (you’re closer to the water)
- Can feel bumpy in rough seas
- Tours usually 7-8 hours
Speedboat (฿1,500-2,500)
- Faster, more islands covered
- Smoother ride
- Usually includes more snorkeling stops
- Less character, more comfort
- Tours usually 5-6 hours
Our recommendation: Go longtail for the authentic experience, but choose speedboat if you get seasick easily or have limited time.
What to Expect: A Typical Day
08:00 — Hotel pickup (most tours include this)
09:00 — Depart from Saladan Pier
10:00 — First stop: Emerald Cave swim-through
11:30 — Snorkeling at Koh Chuak
12:30 — Lunch on Koh Ngai beach
14:00 — Beach time & snorkeling at Koh Kradan
15:30 — Head back to Koh Lanta
17:00 — Return to hotel
Essential Tips for the Best Experience
- Go early in the season (November-February) for calmer seas and clearer water
- Bring reef-safe sunscreen — protect those corals!
- Waterproof bag is essential for Emerald Cave
- Skip breakfast if you get motion sickness
- Wear your swimsuit under clothes — no changing rooms on boats
- Cash only for drinks and tips
Frequently Asked Questions
How much does the 4 Islands Tour cost?
Prices range from ฿800-2,500 depending on boat type. Longtail tours are cheapest, private speedboat charters cost more. Most include lunch, water, and snorkeling gear.
Is the Emerald Cave dangerous?
Not at all. The swim is about 80 meters through a lit cave. Guides accompany you with flashlights and life jackets are provided. Anyone who can swim can do it.
Can non-swimmers join the tour?
Yes! Life jackets are provided for snorkeling and the Emerald Cave swim. Many operators also have flotation noodles.
When is the best time to visit?
November to April offers the best conditions. The caves may close during monsoon season (May-October) due to rough seas.
Should I book in advance?
During peak season (December-February), yes. Tours can sell out. Booking a day ahead is usually enough during shoulder season.
Activities on Koh Lanta
Book through KOHME — compare prices & read reviews
Ready to Explore?
The 4 Islands Tour is one of those experiences that lives up to the hype. That moment when you emerge from the dark cave into a sunlit lagoon? Pure magic. Ready to go? download the KOHME app to browse, compare, and book everything in one place.
Download KOHME to browse and book island tours, snorkeling trips, and more activities on Koh Lanta: Hungry after exploring? Try order food delivery on Koh Lanta for a fuss-free meal back at your place.