Vietnam's Secret Islands: A Guide to Undiscovered Paradises

Stretching more than 3,000 kilometers along the South China Sea and the Gulf of Thailand, Vietnam hides a constellation of islands where turquoise water meets volcanic cliffs, fishing villages serve dawn-fresh seafood, and coral gardens glow beneath the waves. While Phu Quoc and Cat Ba draw the headlines, a quieter archipelago of shores—reached by small ferries and fisherman’s skiffs—rewards travelers who crave solitude, authenticity, and sea-borne adventure.

How to use this guide

This island primer moves north to south, highlighting lesser-known destinations, how to reach them, and what makes each unique. Conditions can change with weather and local regulations; think of this as inspiration you can tailor on the ground with current ferry schedules, homestay availability, and sea conditions.

When to go

Vietnam’s coastline spans multiple microclimates. In the North and the Gulf of Tonkin, calmer seas typically arrive from April to October, though late-summer storms can disrupt sailings. Central Vietnam’s islands see their best weather roughly March to September, with typhoons possible from September to November. The South and Gulf of Thailand archipelagos are driest from November to May, with seas livening up in the southwest monsoon from May to October. Ferries will be canceled if conditions are unsafe—build flexibility into your plans.

Northern whispers: Bai Tu Long’s quiet isles

Co To and Quan Lan

Northeast of Ha Long Bay, the Bai Tu Long seascape trades crowds for wind-sculpted pines and long crescents of sand. Co To is the more developed of the two yet retains a sleepy rhythm: motor down pine-lined roads to Hong Van Beach, climb the lighthouse for blue-on-blue vistas, then linger over dinners of steamed mantis shrimp and clams. Quieter still, Quan Lan mixes dunes with century-old communal houses and gentle surf. Reach both by speedboat from Van Don’s Cai Rong Port; sea conditions dictate departures, and weekday sailings are calmer on both water and crowds.

Central coast gems: volcanoes, garlic, and green water

Ly Son (Quang Ngai)

Ly Son rises from ancient volcanoes, its black-lava coast punctuated by sea arches and garlic fields that scent the breeze. Sunrise at To Vo Gate throws honeyed light through a natural rock window; later, hike the crater rim of Thoi Loi or boat to the even quieter An Binh (Little Island) for translucent shallows. Ferries leave from Sa Ky Port near Quang Ngai City; pack reef-safe sunscreen and respect marked no-take zones in the marine reserve.

Cu Lao Cham (Cham Islands, Quang Nam)

A short speedboat hop from Hoi An’s Cua Dai Pier brings you to a UNESCO Biosphere Reserve where hornbills sometimes glide overhead and coral bommies shelter parrotfish, clownfish, and blue-spotted rays. Day-trippers flock to Bai Chong, but stay overnight in Bai Huong village for an island dawn of fishing nets, coffee, and barefoot lanes. The marine protected area means limited development; bottled-water reduction, trash carry-out, and no-touch snorkeling are part of the pact that keeps the reefs vibrant.

Hon Kho (Quy Nhon)

Off Quy Nhon’s scalloped bays, tiny Hon Kho pairs clear water and simple seafood huts with a wooden walkway that snakes over rocks at low tide. It’s a half-day idyll: snorkel over seagrass meadows, order grilled scallops with scallion oil, then watch fishing coracles wobble home. Boats depart from fishing hamlets north of Quy Nhon; aim for mornings when seas are calmer and visibility brighter.

Binh Ba, Binh Hung, and Diep Son (Khanh Hoa and Ninh Thuan)

South of Nha Trang, a trio of isles remains disarmingly local. Binh Ba, once restricted, now welcomes visitors to lobster farms, hilltop sunset points, and quiet beaches reached by scooter. Across the bay, Binh Hung is smaller and more rugged, with crystalline shallows and homestays perched above wave-lashed rocks; small boats shuttle from the coast road near Binh Tien. To the north in Van Phong Bay, Diep Son is famed for a sandbar path that emerges at low tide, a ribbon of beige threading jade water. Access Binh Ba via Ba Ngoi Port near Cam Ranh, Binh Hung via local boats opposite the island, and Diep Son from Van Gia—tides and wind rule the day, so confirm timings on arrival.

Out there and unforgettable: the southern arc

Phu Quy (Binh Thuan)

A true offshore escape roughly 120 kilometers from the mainland, Phu Quy is all wild headlands, wind turbines, and basalt coves where fishermen grill sea urchin and squid over coconut husk fires. Dive off black-rock ledges into clear water, ride a scooter to Trieu Duong Bay for a picnic, and climb Cam Mountain for a 360-degree sweep over the archipelago. High-speed ferries run from Phan Thiet; sailings cancel in rough seas, and accommodation is largely homestays and small guesthouses.

Nam Du and Hon Son (Kien Giang)

Southwest toward Cambodia, the Kien Hai district is a maze of coconut-fringed isles with chromatic water and friendly, village-scale tourism. Hon Son’s jungle spine hides a satisfying ridge hike to Ma Thien Lanh peak, while Nam Du’s ring road threads past quiet coves and stilted seafood shacks. Ferries leave Rach Gia for both, with the earliest boats offering the calmest crossings; many travelers base on one island and day-trip to the other by local boat.

Hai Tac (Pirate) Islands

Near Ha Tien, a small archipelago with a swashbuckling name yields mellow beaches, shallow reefs, and sunsets that whistle with seabirds. The vibe is resolutely low-key: hammocks strung on porches, fishermen tinkering with nets, and beach fires under a sky pricked with stars. Boats run from Ha Tien; carry cash, and expect limited English but generous smiles.

Con Dao

Once a place of exile, Con Dao today is a national park of cloud forest and empty, luminous beaches, with some of Vietnam’s best diving from March to October and green turtle nesting sites from May to October. Explore wartime history with sensitivity at the old prisons, then rebalance on Dam Trau’s curve of gold sand or trek to Ong Dung Bay for snorkeling in gin-clear water. Flights connect Ho Chi Minh City and Can Tho; a slow ferry from Vung Tau operates weather-permitting. Conservation rules are strictly enforced—ask about guided night patrols during nesting season rather than attempting solo visits to protected beaches.

Culture and cuisine at the waterline

On these islands, the day’s catch dictates the menu. In Ly Son, try garlic-inflected dishes and seaweed salads; around Nha Trang and the central coast, slurp bowls of bun sua, a clean, briny jellyfish noodle soup; in the south, sample grilled nhum (sea urchin) with quail egg and scallion oil. Night squid-fishing trips double as constellation lessons, and morning markets brim with just-landed fish, sea snails, and the percussion of cleavers on cutting boards. Dress modestly in villages, ask before photographing people, and learn a few phrases of Vietnamese—the warmth you’ll receive in return is immediate.

Practicalities

Visas are available in advance for many nationalities through Vietnam’s official e-visa system; check current eligibility and entry points before you book. Ferries and small boats are the lifelines to these isles, and all are weather-dependent; keep buffer days and avoid tight same-day flight connections. ATMs can be scarce or absent on smaller islands—carry sufficient Vietnamese dong. Mobile coverage is improving, and local SIMs or eSIMs are inexpensive. Homestays and small guesthouses dominate; book ahead on weekends and Vietnamese holidays. Scooter rental is common; ride slowly, wear a helmet, and note that some roads are steep, sandy, or potholed. Many islands charge small environmental or tourism fees at landing; keep tickets handy for spot checks.

Travel gently: protecting fragile shores

Island ecosystems are delicate. Use reef-safe sunscreen, avoid stepping on coral or seagrass, decline single-use plastics when possible, and pack out everything you bring. Never buy shells, coral, or turtle products. Obey marine protected area rules and seasonal closures. Drones and photography may be restricted near military posts and ports—when in doubt, ask. Your care keeps these places wild for the next traveler and, more importantly, for the communities and creatures who call them home.

Suggested routes

With ten to twelve days, pair culture with castaway calm: start in Hanoi, then head to Quan Lan or Co To for two nights of northern beach light; fly south to Da Nang for Hoi An and an overnight on Cu Lao Cham; continue to Quy Nhon for Hon Kho and onward to Cam Ranh for Binh Ba or Binh Hung; finish with a flight to Con Dao for three unhurried days of reef and rainforest. For a southern loop from Ho Chi Minh City, ferry to Nam Du or Hon Son, swing west to the Hai Tac Islands and Ha Tien, then hop a flight or ferry to Con Dao for a finale of luminous quiet.

Why they’re still secret

Access, weather, and the modest scale of local life keep Vietnam’s lesser-known islands low on the mass-tourism radar. That’s the gift: a traveler’s landscape shaped not by itinerary boxes but by tides, ferry horns, and the slow drift of village days. Arrive with patience, curiosity, and respect, and these shores will give you their best—sunrises swallowed by the sea, bowls of soup perfumed by brine and smoke, and nights where the only sound is wind combing the palms.