Although Koh Kood (also spelled as Koh Kut) is the fourth island in size (25km x 12km) it remains less developed and less visited by mass tourism. The island is approximately 315 km east from Bangkok and 80 km offshore. The island is in Trat province and can be reached from Trat city. The ferries will leave from the Laem Sook pier (also spelled as Leam Sok) It is also possible to reach Koh Kood by ferry from Koh Chang island which is located north west of Koh Kood.
Ko Kood is as much a nature lover’s destination as a beach lover’s paradise. Parts of the island are still covered with virgin tropical rain-forest while other parts are covered with palm groves and rubber plantations. The island is quite with only small scale nightlife, no go-go bars, no ATMs, no banks and not a single seven/11 supermarket. But there are a few luxury beach resorts. This island is the most eastern one and the closest to the border with Cambodia. From Trat city it is also possible to travel into Cambodia over land. By doing so you avoid the busy border crossing Aranyaprathet – Poipet which is further north. Sihanoukville is a popular coastal destination in Cambodia.
The drive from Bangkok to the Leam Sok Pier will take around 6 hour by minivan. After that you need to take a ferry boat which also takes around 2 hours. The ferries usually only operate at daylight hours and want to avoid the nightfall. This means that the majority will depart before 13:00 PM. If you arrive in the late afternoon or early evening you have to spend a night in Trat city. All together it takes some effort to reach this island. This is probably what keeps Ko Kut untouched and unspoiled.
Background info on Wikipedia