In the Dark and Bright Cave area, you can choose one of the two options: join a rowing sampan boat by the local or do kayaking around to discover on your own. The Bright Cave is allowed to visit, but it is not for the Dark Cave because of its risk. The Bright Cave is surrounded by the limestone mountains in different shapes. Visiting this area, you can have a closer look at the wild beauty of nature here. If you are fortunate enough, you can see the monkey on the rocky mountains. You can only find this kind of monkeys in Cat Ba.