Vietnam. Hon Mun, Nha Trang: It is a coral reef island with no beaches, so it can't get up. But the sea is the clearest, so it is the best place to dive on the four islands. The shallow water area of Wood Island can watch the corals on the seabed. In the sea, colorful small fish swim past you, as if you can reach out and touch, and if you are lucky, you can also see the sea turtles.