Start from your hotel to Cau Da port. Tri Nguyen Aquarium on Mieu Island is the first place to visit, many sea species of Nha Trang/Khanh Hoa province make a small ocean world there. Mun Island is the best island for snorkeling where you can see lots of lives colorful corals and fish. Visit a fishing village and taking a fresh lunch at the island. On the way back you will be able to see caves in which the sea swallows make their nest.