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Option 2: Visit the Dark and Bright cave - famous for the pristine nature and poetic, attractive seascape of Lan Ha Bay. Here you will take some photos of the romantic, lyrical local see-sights. This is also the best time for tourists to enjoying bamboo boat or swimming - which is an interesting activity to discover the truest beauty of the Limestone Mountains and the blue sky of Lan Ha Bay. Afterwards, visitors immerse in the emerald green water of Lan Ha Bay with exciting swimming activities.