Ko Raet Island (Kho Raet Island) is one of the islands under the Plant Genetic Conservation Project under the Royal Initiative of Her Royal Highness Princess Maha Chakri Sirindhorn. Geographically, it is a small island shaped like a rhinoceros (Raet) crouching in the sea. The surrounding waters are exceptionally clear and shallow, thanks to rigorous waste management and the restriction of environmentally damaging tourism activities. The landscape consists of rocky outcrops interspersed with short stretches of fine white sand, making it a vital marine nursery and a habitat for rare marine life that remains surprisingly abundant.

The most significant feature of Ko Raet is its underwater biodiversity, particularly the massive colonies of massive corals (Porites) and branching corals. A true unseen highlight is the Clownfish Village expansive fields of sea anemones swaying with the current, providing a home to various species of Clownfish that visitors can observe at a depth of only 1-2 meters. Furthermore, the island features underwater sculptures designed as fish habitats and diving attractions, perfectly blending art with ecological restoration.

In terms of the visitor experience, Ko Raet offers an exclusive and tranquil feel, distinct from the busier Ko Samae San or Ko Kham. Since there are no large permanent structures or bustling shops, the atmosphere focuses on a "Slow Life" retreat. Visitors can breathe in pure air and listen to the clear sound of the waves. Kayaking around the island allows one to witness the shifting shades of the sea, from emerald green to deep indigo, and visitors can trek to a vantage point for a panoramic view of the entire Samae San peninsula.

For specialized travelers such as academics, documentary photographers, or conservation volunteers, Ko Raet serves as a living nature classroom. It is often a site for studying "coral bleaching" and coral propagation. For families and couples, the island provides inspiration through the beauty of unspoiled nature, serving as a landmark for high-quality, eco-conscious travel.

Ultimately, Ko Raet is more than just a place for relaxation; it represents the success of joint natural resource management between the local community and the Royal Thai Navy. A visit here creates lasting memories while reinforcing the importance of preserving Thailand’s precious marine treasures for future generations.

• By Private Car: Drive to Sattahip District, head toward Chong Samae San Village, and pin your destination to Khao Ma Jor Pier or the "Samae San Community Enterprise Pier." Ample parking is available.

• Island Transfer: You must purchase tickets or book a trip in advance through local operators (such as Samae San Snorkeling Trips), as there are no regular public ferries. Most transfers are by speedboat or long-tail boat, taking about 10 minutes.

• Public Transport: Take a van from Ekkamai or Mochit Bus Terminal (Bangkok-Rayong or Bangkok-Sattahip line). Get off at Kilometer 10 (Km.10) and take a blue songthaew (local truck) to the Samae San pier.

• Best Visiting Season: December to late April offers the clearest water and calmest waves. During the monsoon season (May–October), water clarity may decrease, and there is a risk of storms.

• Conservation Rules: Do not touch the coral, do not catch marine life, and do not use sunscreen containing Oxybenzone use only Reef-Safe sunscreen.

• Food and Drinks: There are no major shops on the island. It is recommended to bring water and snacks.

• Advance Booking: On public holidays, trips to Ko Raet often fill up 2-3 weeks in advance. Contact a Samae San tour agency before traveling.

Admission Fee:

• Local Visitors: Adult 200 - 300 THB, Child 150 THB.

• Foreign Visitors: Adult 500 - 600 THB, Child 300 THB.

• This price includes island entrance fees and area maintenance fees in the snorkeling trip package.

Opening Hours:

• Open for visitors: 08:30 – 16:30