For caves instead of beaches, Phong Nha in central Vietnam has the world's largest underground passages.
The plane banks hard left over the South China Sea and suddenly there it is — a cluster of dark green islands in a navy ocean, no high-rises, no container ships, nothing but jungle and rock and white-sand crescents that look untouched. It's the kind of approach that silences even seasoned travelers. This is , and most Vietnamese have never been.
That's not an exaggeration. Con Dao is Vietnam's most remote inhabited island group — 16 islands 230km off the southern coast, accessible only by a 45-minute flight from Ho Chi Minh City or an unreliable ferry. There are 9,000 people on Con Son, the main island. One town. One proper road. No international chains, no party boats, no Instagram cafes — the polar opposite of the resort towers and night markets that have turned Phu Quoc into Vietnam's package-holiday island.
What there is: the darkest chapter of Vietnamese colonial history, some of the country's healthiest coral reefs, and sea turtles nesting on beaches where you are likely the only human.
Five days here is a start. It won't feel like enough.
Day 1 — The Prison
You can't quite look at the beach without looking at the prison first. Understanding what happened here comes before the swimming, and the island all but insists on it.
The Con Dao Prison complex was built by the French in 1862 and operated continuously for over a century — French colonials, then the Japanese, then the French again, then the South Vietnamese government (with American support). Over 20,000 Vietnamese political prisoners were held here. The conditions were horrific: the infamous "tiger cages" were cramped cells where prisoners were shackled in stress positions, exposed to the elements, doused in lime.
The museum and prison complex are open daily. Entry: VND 40,000 (~$1.60). Plan for three hours walking through cell blocks, punishment chambers, and the tiger cages themselves — restored, with mannequins showing how prisoners were held. The audio guide is in Vietnamese and English.
It's not a comfortable experience. It shouldn't be. But it gives Con Dao a gravity that pure beach destinations lack — the same uneasy blend of paradise and penal history you feel walking the colonial-era cellblocks of India's Andaman Islands. The people who come to this island tend to be different — more reflective, less interested in selfies. That shapes the whole atmosphere.
Day 2 — Dam Trau Beach and the Airport Runway
Dam Trau Beach is frequently listed as Vietnam's most beautiful beach, and the listing holds up: it's extraordinary. A crescent of golden sand backed by dense jungle, reached by a dirt road from the airport. And the airport runway literally ends at the beach — planes land directly overhead as you swim.
The beach is free and nearly empty — count maybe seven people on a Tuesday, a world away from the kitesurf crowds and resort strips of Mui Ne up the mainland coast — and the water is warm and clear. Float for an hour and a plane will pass over once, low enough to see the landing gear. Surreal, and somehow perfect.
In the afternoon, rent a motorbike (VND 150,000/day, ~$6) and ride the island's single main road. Con Son is small — maybe 15km end to end — and the road follows the coast, climbing through jungle and dropping to small bays. Stop at Bai Nhat (a tiny cove accessible by a steep trail), swim, and watch the sunset from a rock.
Dinner at Thu Ba Restaurant in Con Son town: grilled squid and morning glory with garlic. VND 180,000 (~$7.20) for two dishes and a beer. The restaurant is run by a woman whose family has fished these waters for three generations. The squid was caught that morning.
Day 3 — Diving the Marine Park
Con Dao National Park protects some of Vietnam's healthiest coral reefs. The diving here is genuinely world-class — not in a "world-class for Vietnam" way, in an actual "this rivals the Coral Triangle" way. The reef health here rivals what you'll find at Nusa Lembongan off Bali.
Book a two-dive morning with Con Dao Dive Center — VND 2,000,000 (~$80) including equipment. The first dive is at Hon Tai, a rocky islet south of Con Son: hard and soft coral gardens, schools of fusiliers, a Napoleon wrasse the size of a golden retriever, and a sea turtle that swims past at arm's length, utterly unbothered.
The second dive runs deeper — 22 meters at a site called Cathedral Rock. Massive granite boulders covered in soft coral, with reef sharks patrolling the edges. Visibility sits at 15–20 meters, and the dive masters say it hits 30 meters in peak season (March–May).
Con Dao's reefs run healthier than most you'll find in Thailand, Indonesia, or the Philippines — and far quieter than the busy dive boats running out of Nha Trang on the mainland — partly because so few people dive here.
Day 4 — Sea Turtle Nesting at Bay Canh Island
This is the reason to come. Bay Canh Island, in the Con Dao National Park, is a protected nesting site for green and hawksbill sea turtles. From June to September, females haul themselves onto the beach at night to lay eggs.
The ranger-guided night tour runs VND 500,000–700,000 (~$20–28) per person. You take a boat to Bay Canh in the late afternoon, hike through the jungle to the nesting beach, and wait. In silence. No flashlights (except red-filtered ranger lights). No phones.
Wait about two hours. Then the ranger signals. A green sea turtle — easily a meter long, maybe 150kg — emerges from the surf. She moves slowly, deliberately, dragging herself up the sand with flippers designed for water, not land. She digs a pit with her rear flippers, spends about thirty minutes laying eggs (about 100 per clutch), covers the pit with sand, and returns to the sea.
Ten meters away, you can hear her breathing — a heavy, labored exhale between flippers of sand. The rangers see this dozens of times per season, and it still moves them. The boat returns in the dark, the Milky Way impossibly bright above the unpolluted ocean. Nobody speaks.
Day 5 — Hang Duong Cemetery and Departure
Hang Duong Cemetery holds over 20,000 graves of political prisoners — most unmarked. The most visited is the grave of Vo Thi Sau, a teenage resistance fighter executed by the French in 1952 at age 19. She's become a national hero.
Vietnamese visitors leave incense, flowers, and fruit at her grave. Some pray. Some weep. It's a pilgrimage site, not a tourist attraction, and the emotion is palpable even if you don't share the cultural context.
Give the cemetery an hour. Many graves have no name — just a concrete marker in the red earth. The scale of what happened here takes a while to absorb.
Flight back to Ho Chi Minh City at 2 PM. Forty-five minutes and you're back in a city of ten million people, traffic and noise and screens. By then Con Dao already feels like a dream.
What to Do Differently
Bring more cash. Con Dao has a few ATMs but they're unreliable and sometimes empty, and several restaurants are cash-only — it's easy to run low by Day 4.
Stay a week. Five days covers the main island but not the outer islands (Hon Cau, Hon Tre Lon) or multiple dive days. The diving alone warrants a week.
Visit during turtle season. Go in late May — just before the main nesting season — and you might catch a single turtle. June–August visitors report multiple turtles per night. Plan accordingly.
Don't expect Bali. Con Dao is remote, quiet, and deliberately undeveloped. The electricity is sometimes inconsistent. The WiFi is slow. The restaurant options are limited. That's the point. If you need nightlife, boutique cocktail bars, or reliable Instagram upload speeds, this is not your island — for that, there's the full-moon party scene of Koh Phangan.
If you want to feel something — genuinely, in a way that tourism rarely provides — Con Dao delivers. The beauty and the history exist in the same place, and that combination makes everything more intense. The beach is more beautiful because of what happened beside it. The turtles are more moving because the island spent a century as a place of suffering.
Con Dao doesn't sell itself. It doesn't need to.
Continue exploring Vietnam with the world-class caves of Phong Nha, or head to Hanoi and Hoi An for food and culture.
