Bo Hon Island houses most of Halong Bay’s most famous caves such as Sung Sot, Trinh Nu and Trong Cave, all of which are set against a backdrop of mountains, cliffs, and lush forest. Accessible within a two-hour boat ride from Bai Chay Port, it’s widely regarded as Halong Bay’s natural park as there are plenty of cycads, orchids and banyan trees as well as wild monkeys, deer, and chamois.