Koh Kruai, Koh Kham, and Koh Platin are a group of small islands in the Gulf of Thailand, located south of Rayong province, near Koh Samet and within the same sea zone as Khao Laem Ya-Mu Koh Samet National Park. Although not large islands or nationally famous tourist destinations like Koh Samet, these islands are popular among tourists who appreciate nature and diving because they retain their relatively pristine environment, are tranquil, and are not crowded, preserving the natural beauty of the eastern sea.

The islands are characterized by small beaches, clear waters, and shallow coral reefs scattered around them. Koh Kham and Koh Platin are particularly popular snorkeling spots for day trips. The water in this area is crystal-clear turquoise, and during the peak tourist season, from approximately November to April, the sea is relatively calm with no strong waves, allowing for clear visibility of the sandy bottom and underwater coral reefs. The underwater world features staghorn coral, brain coral, sea anemones, and schools of various small fish such as damselfish, parrotfish, and butterflyfish, making this area ideal for those who want to experience the underwater world up close without needing to scuba dive.

Koh Kruai is a small, tranquil island. The beaches in this area aren't very wide, but they offer beautiful scenery and are perfect for private relaxation. The islands feature rocky outcrops interspersed with fine sandy beaches, and are popular spots for tourists to take photos of the azure sea against the sky. Koh Kham is known for its pristine beaches and clear swimming areas, while Koh Pla Teen is one of Rayong's most popular snorkeling spots. Its shallow coral reefs make it ideal for beginner divers or those seeking relaxing snorkeling. Furthermore, the area around the island boasts a diverse array of marine life, including shellfish, sea urchins, and small fish inhabiting the rocks and coral reefs.

Tourism in this island group is mostly done on day trips, departing from Ban Phe Pier or nearby local piers. The short boat ride, compared to other islands in the Andaman Sea, makes it suitable for tourists seeking short getaways from Bangkok or nearby provinces. Currently, many local operators offer speedboat and snorkeling tours, often combining routes to Koh Samet, Koh Thalu, or other snorkeling spots in Rayong. Many tourists come to swim, snorkel, take photos, and relax amidst nature, especially on weekends and during the summer.

Despite the islands' high level of natural beauty, However, much of the area still lacks major facilities, with no shops, restaurants, or permanent accommodation on the islands. Therefore, tourists should bring their own drinking water, food, and essential supplies, and also help maintain cleanliness and avoid touching or stepping on the coral, as the underwater ecosystem of Rayong is a relatively fragile natural resource. Responsible tourism is therefore very important to ensure that the beauty of Rayong's sea and these small islands remains pristine for future generations of tourists.

• Access is strictly via chartered long-tail or speedboats from local piers (such as Ban Phe or nearby fishing piers). It is recommended to contact local boat tour operators in advance for pricing and scheduling.

• Visit between November and April for calmer seas and clearer water.

• Morning boat trips offer cooler weather and better sea visibility.

• Always check weather and sea conditions before departure.

• Book boats or snorkeling tours in advance during holidays.

Admission Fees:

• Free admission (costs are associated with boat rental services).

Opening Hours:

• Recommended to visit between morning and afternoon (boats typically operate between 08:00 – 16:00).