Yes, Koh Samui is a tropical island but it is also located in Thailand, a Buddhist nation which staunchly upholds its conservative culture. And while short-shorts are ideal for traipsing along the beach, you can't wear it on your excursion to the Big Buddha. Oh, no! temples no matter where they are located in Thailand demand respect, you need to dress modestly, hence, be prepared and take along appropriate clothing, for the beach and for honouring the modest culture of Koh Samui. Your basic packing list must include, cotton shirts, shorts and loose skirts or cotton pants, flip flops, a hat, shades and insect repellent. The best resort Samui has to offer are those located along the beach and if you are staying at Anantara Bophut Koh Samui Resort or similar place, pack some colourful lightweight kaftans for the beach and evening dinner.