Thailand's second-largest island, Koh Samui, is one of the most visited tourist destinations, thanks to its stretches of sugary-white sands lapped by turquoise blue waters. While you could spend all day lounging on the picture-perfect beaches and soaking up the breathtaking scenery, Koh Samui has a plethora of activities for you to indulge in. Go snorkelling to lay your eyes on striking oceanic wonders, hop on a board to visit a neighbouring island or two, explore the sprawling Ang Thong National Marine Park or behold the majestic golden Big Buddha statue at Wat Phra Yai Temple.