4-Island Longtail Boat Tour from Koh Lanta: Emerald Cave, Snorkeling & Beach Picnic
Hop a traditional longtail from Koh Lanta for a seven‑hour island circuit: snorkeling at coral gardens, a beachside Thai lunch on Koh Ngai and an 80‑m cave swim into Koh Mook’s Emerald Lagoon. This practical guide explains what to expect and how to prepare.
The Experience
Before You Go
Check tide schedules
Emerald Cave is only accessible at low tide; confirm with the operator before booking and be flexible to weather cancellations.
Bring reef‑safe sunscreen
Protect coral and your skin—apply biodegradable sunscreen before boarding to avoid contact with reef life.
Secure footwear and dry bag
Water shoes make stepping on rocky beaches easier and a small dry bag keeps phones and cash safe from spray.
Prepare for the swim
The cave requires an ~80 m swim in open water; wear a life jacket if you’re not a confident swimmer and tell the guide.
Local Knowledge
Hidden Gems
- •Early morning at Koh Ngai’s eastern beach for calmer snorkeling and fewer crowds
- •A short walk behind Koh Ngai’s beach reveals shaded viewpoints overlooking the reef flats
Wildlife
- •Parrotfish and clownfish around shallow corals
- •Large fruit bats roosting on Koh Maa at dusk
Conservation Note
Stick to marked snorkeling areas, don’t touch coral, and use reef‑safe sunscreen; operators often participate in beach clean‑ups and limit anchoring on reefs.
The islands are part of the Trang–Krabi limestone chain; communities have long relied on fishing and small‑scale trade with Malay and Chinese settlers.
What to Bring
Snorkel mask and finsEssential
Well‑fitting gear improves sightlines and conserves energy during multiple snorkeling stops.
Reef‑safe sunscreenEssential
Protects both your skin and coral ecosystems in shallow snorkeling areas.
Water shoesEssential
Protect feet on rocky shorelines and when entering/exiting longtail boats.
Small dry bag (5–10L)
Keeps phone, wallet and a spare shirt dry from spray and brief swims.
Common Questions
Is the Emerald Cave safe for non‑swimmers?
Access requires an ~80 m swim through a dark tunnel; life jackets are provided but non‑swimmers should discuss alternatives with the guide or remain at the beach.
Do I need to bring snorkeling gear?
Snorkeling equipment is included, but many travelers prefer their own mask for fit and comfort.
How long is the boat ride from Koh Lanta?
Typical longtail transfers to the first island take about 45 minutes; the full circuit runs roughly seven hours including stops and lunch.
Can the tour be canceled for weather?
Yes—operators will change or cancel the itinerary for safety due to high swell, strong winds, or unsuitable tides for Emerald Cave access.
Book This Experience
Check AvailabilityDuration
7 hours
Location
Koh Lanta, Krabi
Difficulty
moderate
Fitness Level
Light to moderate fitness — able to swim and climb in/out of boats and on sandy/rocky beaches
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