Although Koh Samui has greatly improved its infrastructure (roads, electricity, hospital, and more), it’s still a tropical island covered by lush vegetation, sheltering a variety of insects and reptiles. The chances that you encounter a centipede, scorpion, or cobra during your holiday are pretty slim, yet it may happen. To stop any unexpected visitors entering your room, keep your windows and doors closed, and, if you keep your shoes outside, double check inside them before putting them on. Mosquitoes are also plentiful in Samui, and some of them carry diseases, such as Dengue, Chikungunya, and Yellow Fever. So, do not forget to use a good mosquito repellent, especially between 16:00 and 20:00; it’s the period during which Aedes Aegypti (the mosquito that spreads these fevers) is the more active.