On the second day, head to Cat Ba Island, the largest island in Halong Bay. Explore the Cat Ba National Park, home to diverse flora and fauna, including the endangered Cat Ba langur. Take a hike through the lush forests and enjoy panoramic views of the bay from the Ngu Lam Peak. Afterward, relax on the pristine beaches of Cat Ba Island and go for a swim in the crystal-clear waters. In the evening, explore the vibrant night market and try some local street food.
