On the second day, visit Nui Chua National Park, which is located near Vinh Hy Bay. This national park is home to diverse ecosystems, including forests, mountains, and coastal areas. Embark on a hiking trail to explore the park's natural beauty and enjoy panoramic views of the surrounding landscapes. Keep an eye out for the park's wildlife, such as deer, monkeys, and various bird species. Don't forget to visit the Hang Rai (Otter Cave) and admire its unique rock formations. Spend the night camping in the park for a truly immersive experience.