Koh Kudee is a medium-sized island located northeast of Koh Samet, within the Khao Laem Ya-Mu Koh Samet National Park. This park was declared a marine national park to conserve natural resources and coastal ecosystems in Rayong province. The island is tranquil and highly pristine, lacking the large-scale commercial development found on many major tourist islands in the Gulf of Thailand. This makes it ideal for travelers seeking genuine relaxation amidst nature, including beach strolls, snorkeling, and panoramic ocean views.

The island's main beach is "Sin Samut Beach," a small beach with fine white sand, clear water, and a gentle slope, perfect for swimming and relaxing. The waters around the island are crystal clear turquoise, especially during the peak tourist season from November to April, when the sea is calm and underwater visibility is at its best. The island's coastline still boasts diverse natural coral reefs, including staghorn coral, brain coral, and sea anemones, providing habitat for various tropical fish. This makes Koh Kudee one of the most popular snorkeling spots in the Koh Samet archipelago. Many tourists prefer day trips, booking snorkeling packages from Ban Phe or Koh Samet that often include a visit to Koh Kudee in their itineraries.

Another major highlight of the island is the nature trail that winds through coastal and dry evergreen forests to "Eagle Rock Cliff," a famous viewpoint on the eastern side of the island. The trail is approximately one kilometer long, and along the way, tourists will experience the relatively pristine natural environment of the island's forest, including coastal shrubs, sea-resistant trees, and natural rock formations. From the viewpoint, visitors can enjoy stunning views of the azure sea and the surrounding smaller islands of the Koh Samet archipelago. This is especially beautiful during the morning and evening when the sunlight reflects off the water, creating a unique and breathtaking landscape.

Koh Kudi is also important as a marine ecosystem conservation area on the eastern coast, as the area around the island serves as a habitat and nursery for many species of aquatic animals. The national park has implemented measures to control certain types of tourism activities to prevent negative impacts on the coral reefs and the environment. Tourists visiting the island are often advised to avoid stepping on coral, littering, and using sunscreen containing coral-damaging chemicals, in order to help maintain the natural integrity in the long term. Cooperation between park officials, tourism operators, and tourists themselves is crucial in ensuring that Koh Kudi remains one of the most pristine marine destinations in Rayong province.

Although Koh Kudi doesn't have the amenities or entertainment venues of larger tourist islands, its charm lies in its simplicity and pristine nature. Tourists can spend their time on the island relaxing under the shade of trees, listening to the waves, exploring the coastline, photographing the clear sea and natural rock formations, or snorkeling to see schools of colorful fish in the shallow waters near the beach. The tranquility of Koh Kudi makes it a popular destination for those seeking to escape the hustle and bustle of big cities and experience the unspoiled and peaceful nature of the eastern coast.

• From Bangkok, head to Ban Phe Pier or Laem Mae Phim Pier in Rayong. From there, you can charter a local long-tail boat (approx. 30–45 minutes) or a speedboat (approx. 15–20 minutes) to reach Koh Kudeer. Most travelers find it convenient to book an island-hopping snorkeling tour (such as a 4-island or 5-island package) departing from Koh Samet or Ban Phe, which regularly includes Koh Kudeer as a main stop.

• Arrive early in the morning to maximize your island time.

• The best sea conditions are usually from November to April.

• Bring your own snorkeling mask for better hygiene and comfort.

• Carry enough drinking water since facilities are limited.

Admission Fees:

• Thai Citizens: Adults 40 THB / Children 20 THB

• Foreigners: Adults 200 THB / Children 100 THB

Opening Hours:

• Open daily from 08:30 AM – 04:30 PM (Visits are not advised during the heavy monsoon season or during the national park's annual environmental recovery closure).