Wondering what to do on Cat Ba Island? Vietnam’s largest island — and the gateway to Lan Ha Bay — packs an extraordinary amount of adventure into a compact 350 km² area. From jungle trekking in a UNESCO Biosphere Reserve to swimming at hidden beaches accessible only by boat, Cat Ba Island offers things to do that rival destinations ten times its size. Most visitors experience Cat Ba as a stop on a Lan Ha Bay day cruise, but the island deserves far more than a quick photo stop. Here are the 8 best experiences for 2026.
Quick Facts — Cat Ba Island
| Detail | Information |
|---|---|
| Location | Hai Phong Province, 150 km east of Hanoi |
| Area | 350 km² (largest island in Ha Long Bay area) |
| Population | ~15,000 residents |
| UNESCO | Cat Ba Archipelago Biosphere Reserve (2004) |
| Best Months | April–October |
| Getting There | Speedboat from Hai Phong (45 min) or cruise from Hanoi |
8 Best Things to Do on Cat Ba Island
1. Explore Cat Ba National Park
Covering 263 km² of the island’s interior, Cat Ba National Park protects one of the most diverse ecosystems in Southeast Asia. The park is home to the critically endangered Cat Ba langur — with fewer than 70 individuals remaining, it is one of the world’s rarest primates. Two main hiking trails wind through tropical forest: the short Kim Giao Forest loop (2 km, 1 hour) and the challenging peak trail to Ngu Lam viewpoint (3 km, 2 hours). Entry fee: 80,000 VND (~$3.20) as of 2026.
2. Discover Trung Trang Cave
This impressive limestone cave stretches 300 meters through a karst mountain, with stalactites and stalagmites formed over 2.5 million years. The well-lit walkway makes it accessible for all fitness levels. Located just 15 minutes from Gia Luan Pier by electric car, Trung Trang Cave is a standard stop on Tropical Cruise itineraries. Entry fee: 40,000 VND (~$1.60).
3. Climb to Cannon Fort Viewpoint
Built during the Vietnam War as an anti-aircraft defense position, Cannon Fort (Phao Dai Than Cong) sits 177 meters above sea level and offers the most spectacular 360° panorama on the island. On clear days, you can see across Lan Ha Bay, Cat Ba Town, and the endless karst landscape stretching to the horizon. The climb takes 20 minutes from Cat Ba Town. Entry fee: 40,000 VND. Best visited at sunset.
4. Visit Hospital Cave
A fascinating piece of wartime history, this three-story cave complex served as a secret hospital during the Vietnam War, capable of treating 150 patients simultaneously. The cave features operating rooms, a natural ventilation system, and a small cinema room for recovering soldiers. A guide (included with entry) explains the history. Located 10 km north of Cat Ba Town. Entry: 50,000 VND (~$2).
5. Kayak Through Lan Ha Bay
Cat Ba Island is the launch point for kayaking adventures in Lan Ha Bay. The calm, sheltered waters between limestone karsts are ideal for all skill levels. The highlight is paddling through Dark & Bright Cave — a narrow tunnel opening into a hidden lagoon. Half-day kayak tours from Cat Ba Town: $25–$40/person. Or join a Tropical Cruise day trip with kayaking included.
6. Swim at Cat Co Beaches
Three small beaches — Cat Co 1, 2, and 3 — line the southeast coast of Cat Ba Town. Cat Co 1 is the largest and most developed with beach chairs and cafés. Cat Co 3 is the quietest and most scenic, tucked into a rocky cove. All three are connected by a cliffside walking path that offers beautiful coastal views. Free entry; chair rental 50,000 VND.
7. Explore Cai Beo Floating Village
One of the world’s oldest fishing settlements, Cai Beo has archaeological evidence of human habitation dating back 7,000 years. Today, colorful houseboats and floating fish farms create a photogenic scene just a short boat ride from Cat Ba Town. Small boat tours: 100,000–150,000 VND (~$4–6). The on-site museum displays artifacts from Stone Age excavations.
8. Cycle the Coastal Road
Rent a bicycle or motorbike and ride the 30 km coastal road from Cat Ba Town to Gia Luan Pier. The route passes through fishing villages, rice paddies, and forest-covered hills with views of Lan Ha Bay. Bicycle rental: 100,000 VND/day. Motorbike: 150,000 VND/day. Allow 3–4 hours for a leisurely round trip with photo stops.
🌊 Insider Tip: Most day cruise visitors only see Trung Trang Cave and the national park museum — a 45-minute stop. If you have the flexibility, consider staying overnight in Cat Ba Town to experience Cannon Fort at sunset and the Cat Co beach walk. Budget guesthouses start from $10/night.
Getting to Cat Ba Island
| Route | Transport | Duration | Price (2026) |
|---|---|---|---|
| Hanoi → Cat Ba (via cruise) | Bus + day cruise | 3.5h drive + 6h cruise | From $65/person |
| Hai Phong → Cat Ba | Speedboat (Got Pier) | 45 minutes | 280,000 VND (~$11) |
| Ha Long → Cat Ba | Ferry from Tuan Chau | 1 hour | 200,000 VND (~$8) |
Frequently Asked Questions
How many days do you need on Cat Ba Island?
A day cruise covers the highlights (cave, national park, kayaking). For hiking, beaches, and Cannon Fort, plan 2–3 days. Budget travelers often spend a week combining Cat Ba with Lan Ha Bay kayaking, cycling, and Cat Co beach time.
Is Cat Ba Island worth visiting in 2026?
Absolutely. Cat Ba remains far less commercialized than Ha Long Bay despite offering equal natural beauty. The combination of UNESCO biosphere, pristine beaches, wartime history, and access to Lan Ha Bay makes it one of Northern Vietnam’s most complete island destinations.
What is the best month to visit Cat Ba Island?
May through October offers the best weather for swimming and outdoor activities. September–October combines warm temperatures (25–30°C) with fewer tourists. Avoid late November through February when temperatures drop below 15°C and seas can be rough.
Lan Ha Bay is part of the Cat Ba Archipelago UNESCO Biosphere Reserve, recognized for its outstanding biodiversity and geological significance.
