Things to Do on the Similan Islands: Complete 2026 Guide

The Similan Islands — nine granite and coral islands 84 km off the coast of Phang Nga — are consistently ranked among the world’s top ten dive and snorkel destinations. The national park is open 15 October to 15 May only, protecting the reef during monsoon season. Here is what to do when you visit.

1. Snorkeling the Reef

The primary activity for day-trippers: snorkel over shallow coral gardens teeming with parrotfish, triggerfish, sea turtles, and the occasional leopard shark resting on the sandy bottom. The best snorkel sites on a day trip include Christmas Point, Donald Duck Bay, and the rocks around Ko Similan (Island 8). Visibility is typically 15–30 metres.

Book: Similan Islands Snorkeling Day Trip from Khao Lak

2. Scuba Diving

The Similans have dive sites for every level. Elephant Head Rock (Ko Similan, site 8) is famous for its swim-throughs and soft coral; Fantasea (site 7) has deep walls and regular manta sightings in Feb–Apr; Anita’s Reef (site 9) is a gentle slope perfect for beginners. The PADI dive centres in Khao Lak run daily liveaboards and day-dive boats.

3. Beach Time on Donald Duck Bay (Island 4)

The white-sand beach at Ko Miang (Island 4, also known as Donald Duck Bay) is one of the most picturesque in Thailand — the natural granite boulders frame a turquoise bay visible from the hillside viewpoint. Most day trips include 1–2 hours of free beach time here.

4. Viewpoint Hike (Ko Similan, Island 8)

A 20-minute walk from the boat landing leads to the top of Ko Similan, rewarding you with a panoramic view of the island chain stretching north and south. Not strenuous; accessible to most fitness levels in flip-flops. Worth the 20 minutes even if you do nothing else ashore.

5. Sea Turtle Spotting

Green and hawksbill sea turtles nest on the Similan beaches Nov–Feb. In the water, turtles are a regular sighting at shallow reef sites; green turtles graze on seagrass beds in the sandy areas between coral heads. The national park runs a turtle monitoring program; rangers sometimes share sightings with snorkel guides.

6. Island Camping (Overnight)

The national park operates a small campground on Ko Miang (Island 4) for overnight stays — tent rental available. This gives you access to the islands at dawn and dusk when day-trippers are absent, dramatically improving wildlife and snorkel quality. Book via the DNP national park office; spaces are limited.

7. Manta Ray Season (February–April)

Oceanic manta rays pass through the northern Similans during late dry season. Manta sightings are not guaranteed — they respond to plankton blooms and current — but Richelieu Rock (near Ko Surin, not technically Similan) is the most reliable manta site in the region. If mantas are a priority, a liveaboard that combines Similan with Richelieu is the best option.

8. Whale Shark Encounters

Whale sharks pass through Similan waters infrequently but regularly enough that liveaboard operators track them. They are most often sighted at depth on the east-side pinnacle dive sites (Elephant Head Rock, Fantasea). A snorkeling encounter on the surface is rare but not unheard-of.

Practical Information

  • Open: 15 October – 15 May
  • Park fee: included in the Khao Lak Land Discovery day-trip price
  • Departure port: Tab Lamu Pier, 30 minutes south of Khao Lak
  • Speedboat transfer: 60–90 minutes from Tab Lamu
  • What to bring: reef-safe sunscreen, cash for park vendors, motion-sickness tablets if prone

Getting to the Similan Islands

All Similan day trips depart from Tab Lamu Pier, approximately 30 km south of central Khao Lak. If you are staying in Khao Lak, most tour operators include hotel pick-up. If you are arriving from Phuket Airport, a private transfer to your Khao Lak hotel puts you 10 minutes from the pier.

Day trip to the Similans starts here

Khao Lak Land Discovery runs the Similan Islands Snorkeling Day Trip with hotel pick-up from all Khao Lak hotels, all snorkel equipment, and national park fees included.

Book: Similan Islands Day Trip →

Similan vs Surin Islands: Which is Better?

Both are world-class; the difference is access and character. The Similans are larger, with more dive sites and beach options. Surin is more remote, with better manta ray potential (Richelieu Rock) and a wilder feel. You can only do both on a liveaboard. For a single day trip, Similan is the more versatile choice; Surin is for dedicated divers.

Read: Similan vs Surin Islands Compared

Getting to Khao Lak for your Similan trip?

All Similan Islands day trips depart from Khao Lak's Tab Lamu pier. Khao Lak Land Discovery offers private transfers from Phuket Airport to Khao Lak (฿1,800) — fixed price, meet-and-greet, free flight tracking.

Book your transfer →

Getting to the Similan Islands: See our complete guide on how to get to the Similan Islands from Khao Lak — pier information, departure times, and the fastest route from Phuket Airport.

Time your Similan day trip right by arriving on a private Khao Lak transfer from the airport.

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Similan Islands Snorkeling Tour From Khao Lak Similan Islands Snorkeling Tour from Khao Lak from ฿3,900

Frequently asked questions

When is the Similan Islands National Park open?
The park is closed annually from 16 May to 14 October so the reef can recover from monsoon swell, reopening on 15 October. Trips only run inside that window — always check current dates before booking close to either edge of the season.
Where do Similan Islands day trips depart from?
Almost all Similan day trips leave from Tab Lamu Pier, about 30 km south of central Khao Lak. The speedboat crossing to the islands takes 60–90 minutes; most operators, including Khao Lak Land Discovery, include hotel pick-up.
Similan or Surin Islands — which should I choose?
Both are world-class, but the Similans are larger with more dive sites and beach options, making them the more versatile pick for a single day trip. Surin is more remote and wilder, with better odds of manta rays near Richelieu Rock — a better fit for dedicated divers.
Can I stay overnight on the Similan Islands?
Yes — the national park runs a small campground on Ko Miang (Island 4) with tent rental available, bookable through the DNP park office. Staying overnight gets you the islands at dawn and dusk once the day-trip boats have left, with noticeably better wildlife and snorkeling.
Is snorkeling gear and the park fee included in a day trip?
On Khao Lak Land Discovery's Similan Islands Snorkeling Day Trip, yes — the national park fee and all snorkel equipment are included in the trip price.