Cua Dai beach is about 5km from Hội An is easy to bike to. There are resorts and hotels along the beach, but it's a large beach and you'll have plenty of space for playing in the sand or sunbathing. During the day, it's full of tourists and vendors selling souvenirs and drinks. A more interesting choice would be to visit at sunset to see the hundred of Vietnamese that flock to the beach to swim, plat, and eat. After dark, they lay out mats and have intimate dinners in small groups.
This bay is on Route 1 about 80km. from the city of Hue. It's set in a stunning natural panorama of mountains, rivers, lakes, islands, and a huge white-sand beaches that spreads out over 32km. This area hasn't been completely exploited by tourists yet, but there is a tourism development plan in the works. There are a few resorts but nothing big. The beach is practically deserted.
Mui Ne is a small coastal village near the town of Phan Thiet. Gradually it has become one of the most popular beach destinations of Southern Vietnam and is only 4 hours by bus from Ho Chi Minh City. Mui Ne Beach stretches along 15 km. Along some of it you can see sections of resorts but there are palm trees along the whole way. Some sections of the beach are suitable for fishing and others are suitable for swimming. The area closest to the fishing port (east) is not very clean and there are the remains of molluscs, algae, jellyfish and garbage, and it's frequented by fishermen and boat-basket shellfish pickers. The other side (west) is cleaner and has floodlights and is a favoured spot for kitesurfers. Mui Ne Beach is the perfect destination for a weekend getaway escape from the hustle and bustle of Ho Chi Minh City.
Phú Quốc is the largest island in Vietnamese and it’s located in the Gulf of Thailand only 10km. south of Cambodia. There are regular flights from Ho Chi Minh City and ferries from Rạch Giá. Sao Beach (aka Bai Sao or Star Beach) is one of the last virgin beaches in Vietnam. It is located in the southeast of the island, kilometers away from the nearest village or resort. The only way to get there is a dirt road that doesn't have many signs. Actually, the best way to get there is on a bike. The beach has white sand, shallow waters, and is completely surrounded by jungle. There's nothing there except two small restaurants serving freshly-caught seafood at really cheap prices. There are basically no tourists on Phú Quốc, let alone at Sao Beach. The few Vietnamese who come to the beach go only to the restaurants and the rest of the beach is deserted. It’s like having a private beach all to yourself!