Diving introduction: The most important thing not to miss when visiting the Similan Islands is diving. Even if you have no diving training, you can definitely enjoy diving and watching fish. Wear a mask, look down on the sea, and enjoy the beautiful corals up close. Colorful tropical fish swim by, especially the big red fish, which is amazing. Under the sunlight, the underwater world is as beautiful as a dream. After a while, a large group of black fish swam over, and soon a large group of white fish passed by. If you are lucky, you can see small sharks and manta rays.