Travel Tips

The Best Things to Do in Cat Ba Island

Cat Ba is the largest island in the Ha Long area, sitting on the southern edge of the bay and guarding the entrance to quieter Lan Ha Bay. Since 2023 it has shared a UNESCO World Heritage listing with Ha Long Bay as the Ha Long Bay and Cat Ba Archipelago, and it makes a rewarding base for anyone who wants the same karst scenery with more to do on land. Cat Ba town is developing fast and can feel like a building site in parts, but the island beyond it, all forest, coves and quiet water, is the reason to come.

Below is our honest guide to the things worth your time on Cat Ba, from Lan Ha Bay boat trips and national park treks to the beaches, the caves and the climbing. If you would rather see the bay from a boat, our Ha Long Bay cruises include routes that sail the quieter Lan Ha side, and the guide to the three bays explains how they differ.

Cruise and kayak Lan Ha Bay

The single best thing you can do from Cat Ba is get out onto Lan Ha Bay, the cluster of karsts, lagoons and hidden beaches just off the island's east coast. It shares the same scenery as Ha Long Bay but sees far fewer boats, and being on the Cat Ba side you reach it in minutes rather than the long transfer from the mainland. A day boat or an overnight cruise takes you out among the islands, and a paddle by kayak into the sea caves and quiet lagoons is the highlight for most people. It is the calmest, most rewarding way to see the karsts, and the reason a lot of our travellers choose this side of the bay.

Trek Cat Ba National Park

Much of the island is protected as Cat Ba National Park, a swathe of limestone forest that is home to the rare Cat Ba langur, one of the world's most endangered primates. The headline walk is the climb to Ngu Lam peak, a steep but short trail to a viewpoint over the forest canopy, while longer routes cross the park on foot to the remote village of Viet Hai. It is humid work and good shoes help, but the reward is a side of the island most day-trippers never see. The park is also where you will find Trung Trang Cave, a cool limestone tunnel you can walk through.

Watch the sunset from Cannon Fort

For the best view on the island without a boat, head up to Cannon Fort, a hilltop military post from the French and American wars with old gun emplacements and tunnels still in place. The reason to go is the panorama: Cat Ba town and harbour on one side, the karsts of Lan Ha Bay on the other, and it is one of the finest sunset spots in the whole Ha Long area. Go late in the afternoon, walk the short loop through the bunkers, and stay for the light dropping over the bay.

Find a beach

Cat Ba has a run of small, sandy coves, the best known being the three Cat Co beaches linked to town by a cliffside path. Cat Co 1 and 3 are the busier, more developed pair, while Cat Co 2 is quieter and more low-key. For more space, the beaches out at Tung Thu or the tiny coves you reach on a Lan Ha boat trip are calmer and cleaner. None of them is huge, but a swim and an hour on the sand slot nicely between the boat trips and the treks.

Step into the island's war history at Hospital Cave

One of Cat Ba's more unusual sights is Hospital Cave, a secret three-storey hospital and bomb-proof shelter built inside a mountain during the American war. A guide walks you through the wards, the operating room and the old cinema, and it is a sobering, memorable hour that adds a bit of history to a trip that is otherwise all scenery. It sits on the main road across the island, so it is easy to fold into a day heading to the national park or Viet Hai.

Climb the karsts

Cat Ba and Lan Ha Bay are the rock-climbing capital of Vietnam, with limestone cliffs rising straight out of the sea. Guided sessions run for all levels, from first-timers on the crags at Butterfly Valley to the pure thrill of deep water soloing, climbing ropeless above the bay and dropping into the water when you come off. It is one of the most exciting things you can do here, run by experienced local operators, and no experience is needed to give the beginner routes a go.

Visit Viet Hai village and Monkey Island

To see how island life used to be, make for Viet Hai, a tiny farming and fishing village tucked in a valley on the far side of the park, reached by boat or by bike and walk. It is a peaceful, low-key place to cycle around and stop for lunch, a world away from the town. On the water nearby, Monkey Island is a quick boat hop with a beach and a resident troop of monkeys, entertaining for children though the monkeys are bold, so keep food and bags close.

Getting there, and the cable car

Part of the fun of Cat Ba is the journey. Most people come via Hai Phong and the road across to the island, and the Cat Hai to Phu Long cable car, strung on some of the tallest towers in the world, crosses the channel with big views if you time it right. Others arrive by boat straight from a Lan Ha or Ha Long cruise. However you come, it is worth a scenic leg rather than a chore, and our guide to visiting Cat Ba covers the routes and the current construction in town.

So how long do you need on Cat Ba?

Two nights is the sweet spot: enough for a full day out on Lan Ha Bay, a morning trek or climb, and time for a beach and the sunset without feeling rushed. One night works if the island is really just a base for a Lan Ha boat trip, though you will be busy. If you want to slow down, add the national park properly and perhaps a night in Viet Hai, three nights is easily filled. Many people fold Cat Ba into a Ha Long cruise, spending a night afloat and a night or two on the island.

How Cat Ba fits a wider Vietnam trip

Cat Ba sits in the north, an easy add-on to Hanoi and the Ha Long area, and it pairs naturally with a cruise on the quieter Lan Ha side. As private planners, we carefully craft the whole trip around you: we match the boat and the number of nights to how you like to travel, weigh Cat Ba against a straight cruise, steer you to the calmer water and the better base away from the building work, and handle the transfers so the island slots in without a scramble. Our north Vietnam tours page shows how Cat Ba links to Hanoi and the bay, our Ha Long Bay tours cover the cruises and day trips, and if you are shaping a longer route, our private Vietnam itinerary planning ties the island into the whole trip. If you are still weighing it up, our honest take on whether Ha Long Bay is worth it is a good place to start.

Common questions about Cat Ba Island

Is Cat Ba Island worth visiting?

Yes, especially if you want the karst scenery of the Ha Long area with more to do on land. Cat Ba is the base for Lan Ha Bay, which is quieter than Ha Long Bay, and it adds trekking, climbing, beaches and history. Cat Ba town is developing and can feel busy, but the island and the bay around it are the draw.

What is the best thing to do on Cat Ba?

For most people it is a boat trip and kayak on Lan Ha Bay, the cluster of karsts and lagoons just off the island that stays far quieter than Ha Long Bay. Trekking Cat Ba National Park, watching the sunset from Cannon Fort and rock climbing are the other standouts.

How many days do you need on Cat Ba?

Two nights is the comfortable sweet spot, enough for a full day on Lan Ha Bay, a morning trek or climb, and time for a beach and the sunset. One night works if the island is just a base for a boat trip, while three nights lets you add the national park and a night in Viet Hai village.

Is Cat Ba better than Ha Long Bay?

They share the same scenery, but Cat Ba and the neighbouring Lan Ha Bay see far fewer boats and give you more to do on land, so many travellers prefer them. Ha Long Bay is more famous and has the bigger cruise fleet. Our guide to the three bays runs through the differences to help you choose.

How do you get to Cat Ba Island?

Most people travel via Hai Phong and cross to the island by road, including the Cat Hai to Phu Long cable car, or arrive by boat from a Lan Ha or Ha Long Bay cruise. From Hanoi it is a half-day journey by a mix of road and water, and a private transfer makes it straightforward.

When is the best time to visit Cat Ba?

Spring, roughly March to May, and autumn, September to November, are the most reliable, with warm, drier weather and calmer seas for the boat trips. Summer is hot and busy with domestic holidaymakers, while winter is cooler and can be misty, softening the views.