Take a day trip to Phong Nha-Ke Bang National Park, a UNESCO World Heritage Site known for its stunning caves and karst mountains. Explore the famous Phong Nha Cave, which boasts magnificent stalactite and stalagmite formations. Take a boat ride along the Son River to reach the cave entrance and marvel at its natural beauty. Afterward, visit the Paradise Cave, one of the most beautiful caves in the park. Enjoy a picnic lunch amidst the picturesque surroundings. In the evening, return to Nghe An and relax.