Koh Samui's famous beaches — Chaweng, Lamai, Bophut — are beautiful, but they're not exactly secrets. The real treasures are the hidden beaches scattered across nearby islands and along Koh Samui's inaccessible southern coast. These stretches of pristine sand can only be reached by boat, which means no crowds, no vendors, and no noise. Here are 7 of our favorites.
1. Koh Rap West Beach
A crescent of white sand on the uninhabited island of Koh Rap, about 20 minutes by longtail from Thong Krut. With no structures, no facilities, and usually no other visitors, this is as close to a "private island" experience as you'll find near Koh Samui. The shallow turquoise water is warm and calm, perfect for swimming and snorkeling.
How to visit: Book our Koh Rap BBQ tour (3,500 THB/person) or charter a private longtail from Thong Krut pier.
2. Koh Tan Coral Beach
Koh Tan (also known as Coral Island) sits just 15 minutes by longtail from Koh Samui's south coast. The island has several small beaches, but the best one is on the northwest side — a narrow strip of white sand backed by coconut palms with exceptional snorkeling directly offshore. The coral formations start just meters from the beach.
How to visit: Our Koh Tan & Pig Island tour includes this beach stop (2,800 THB/person). Private longtail charters are also available for groups.
3. Koh Madsum (Pig Island) Beach
Made famous by its resident swimming pigs, Koh Madsum has a long, gentle beach with powder-fine sand and shallow water that stretches far out. Beyond the photogenic pigs, the beach itself is stunning — wide, clean, and backed by untouched vegetation. It's especially good for families with young children thanks to the calm, shallow water.
How to visit: Included in our Koh Tan & Pig Island tour (2,800 THB/person), or reachable by private longtail from Thong Krut.
4. Ang Thong Park Beaches
The 42 islands of Ang Thong National Marine Park contain dozens of untouched beaches, most of which see only a handful of visitors per day. The beaches on Koh Wua Talap (the main island) and the smaller surrounding islets offer blindingly white sand, crystal-clear water, and dramatic limestone cliffs as your backdrop. Since the entire archipelago is a protected national park, these beaches are in pristine condition.
How to visit: Our Ang Thong tour (4,400 THB/person) includes beach time. The park is closed November 1 to mid-December.
Visit These Hidden Beaches
Charter a private longtail or speedboat to explore the secret beaches around Koh Samui.
Get My Instant Quote5. Koh Samui South Coast Coves
The rugged southern coastline of Koh Samui between Laem Sor and Thong Krut is dotted with small, rocky coves and hidden sandy beaches. There are no roads leading to most of them — the only access is by sea. These pocket beaches are typically just 20-50 meters wide, framed by large boulders and tropical vegetation. The isolation is remarkable: you can be just a few kilometers from busy Lamai Beach and feel like you're on a deserted island.
How to visit: Charter a private longtail from Thong Krut and ask your captain to explore the south coast. This is a custom itinerary — contact us on WhatsApp to arrange it.
6. Koh Taen Noi (Little Coral Island)
The tiny islet of Koh Taen Noi sits just east of Koh Tan and is barely 100 meters across. At low tide, a sand bar connects it to Koh Tan, creating a unique natural bridge you can walk across. The beach around the islet is surrounded by shallow coral gardens, making it one of the best spots for easy snorkeling in the entire Samui area. It feels like your own private sandbar in the middle of the ocean.
How to visit: Accessible on the Koh Tan tour or by private longtail charter. Best visited at low tide when the sand bar is visible.
7. Ang Thong Kayak Beaches
Some of the most spectacular hidden beaches in the Ang Thong archipelago are too small and too tucked between limestone formations for speedboats to access. The only way to reach them is by kayak. During the kayaking segment of the Ang Thong tour, you paddle past (and can land on) tiny crescent beaches nestled in cliff-walled coves. These micro-beaches — some just 10 meters wide — offer a level of seclusion that's almost impossible to find elsewhere in Thailand.
How to visit: Included in our Ang Thong tour. Private charters allow more time for kayak exploration.
Quick Comparison
| Beach | Access | Best For | From |
|---|---|---|---|
| Koh Rap | Longtail (20 min) | BBQ, total privacy | 3,500 ฿ |
| Koh Tan | Longtail (15 min) | Snorkeling, coral | 2,800 ฿ |
| Koh Madsum | Longtail (15 min) | Families, swimming pigs | 2,800 ฿ |
| Ang Thong | Speedboat (1h) | Scenery, photography | 4,400 ฿ |
| South Coast Coves | Longtail (custom) | Isolation, adventure | Private charter |
| Koh Taen Noi | Longtail (20 min) | Sand bar, snorkeling | 2,800 ฿ |
| Kayak Beaches | Kayak (from Ang Thong) | Seclusion, kayaking | 4,400 ฿ |
Tips for Visiting Hidden Beaches
- Bring everything you need. These beaches have zero facilities — no shops, no toilets, no shade structures. Pack sunscreen, water, snacks, and a towel.
- Wear reef-safe sunscreen. These pristine marine environments depend on it. Chemical sunscreens damage coral.
- Take your trash with you. Leave nothing behind. Part of what makes these beaches special is their cleanliness.
- Go early. The few other boats that visit these spots tend to arrive after 10am. Early departures (before 9am) mean maximum privacy.
- Consider a private charter. A longtail boat for your group (up to 10 people) from Thong Krut gives you complete flexibility to explore multiple beaches at your own pace.
- Check the tides. Some beaches (especially Koh Taen Noi's sand bar) are best at specific tides. Your captain will know the optimal timing.
Explore the Secret Side of Koh Samui
Custom boat trips to hidden beaches — private longtail or speedboat, up to 20 guests.
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