Da Dia Rapids is another natural wonder in Phu Yen that you shouldn't miss during your bank holiday trip. It is a unique rock formation formed by volcanic activity millions of years ago. The rocks are arranged in a hexagonal pattern, creating a mesmerizing sight. Take a walk along the rapids and feel the power of nature. The best time to visit is during high tide when the waves crash against the rocks, creating a dramatic scene. Don't forget to wear comfortable shoes as the rocks can be slippery. Take some time to relax and enjoy the peaceful ambiance of this natural attraction.