Elephant Trekking Koh Samui is the largest island in the archipelago, the third largest in Thailand and one of the country’s most important destinations with 800,000 visitors a year and rising. Koh Samui is another popular excursion on the island. This ecologically-sound experience begins with an elephant ride around the coconut plantations and jungles of the island’s interior. It’s followed by an elephant show and an opportunity for you to feed the elephants by hand.