Cát Bà Island

Cát Bà is the largest island in Hạ Long Bay and administratively part of Hải Phòng rather than Quảng Ninh. What that means in practice: the karst seascape on the Cát Bà side is called Lan Hạ Bay, and it gets a fraction of the cruise traffic the main Hạ Long bay does. Same geology, same green water, half the boats. For a lot of travellers it is now the better choice.

What's distinctive

Lan Hạ Bay. 300+ karst islands south-east of Cát Bà town. Kayaking, swimming and rock-climbing are all feasible because the bay is quieter and the protected anchorages are not full of cruise boats. Standard day trip from Cát Bà town: 600,000–900,000 VND for boat, kayak, lunch, two beach stops and a swim cave.

Cát Bà National Park. Covers half the island. The Frankfurt Zoological Society runs the Cat Ba Langur Conservation Project here — fewer than 70 of the golden-headed langurs are left, all on this one island. Two trekking routes: the easy 4 km loop from the headquarters, and the harder 18 km Ao Ếch route to Việt Hải village (guide recommended).

Việt Hải. A tiny village inside the national park, reached on foot or by boat from Lan Hạ. Two small homestays; almost no traffic.

The Cannon Fort. Hilltop fortifications above Cát Bà town. The cannons are Vietnamese-era; the view of the harbour and karsts is the reason to go. 80,000 VND.

How to get there

Cát Bà is accessible by ferry only — there is no airport. From Hanoi the standard option is a bus-boat-bus combination sold by Daiichi, Cát Bà Express or Good Morning Cát Bà:

Leg	Time
Hanoi → Hải Phòng (Got pier) by bus	2.5 hours
Got pier → Cái Viềng by speedboat ferry	25 min
Cái Viềng → Cát Bà town by bus	45 min

Total around 4.5 hours door-to-door, 280,000–350,000 VND. Several departures daily; book a day ahead in summer.

A new cable car from Cát Hải island also operates (the world's longest sea-crossing cable car), useful if you are driving.

From Hạ Long city: ferry from Tuần Châu to Gia Luận on the north of Cát Bà, then 30 km by road. This is the route the Hạ Long–Cát Bà cruises stitch together.

When to visit

April–May and September–October are the windows: warm, dry, swimmable, no typhoons. June–August is hot and busy with Vietnamese domestic tourism; July is the worst month for crowds in Cát Bà town. November–March is grey, cool (15–20°C) and quiet, with cheap rooms but cold sea.

Typhoons (Aug–Oct) can shut ferries for two or three days at a time — build slack into the schedule.

Where to stay

Three zones:

• Cát Bà town: Most accommodation, restaurants and bars. Loud, neon, fine for one night. Sea Pearl, Sunrise Resort, and the long-running Cát Bà Sunrise are the usual choices.
• Cát Cò beaches (1, 2, 3): Walkable from town but quieter. Cat Ba Beach Resort sits above Cát Cò 1.
• The west side / Xuân Đám: Quiet, ricefields, a small handful of homestays and the Whisper Nature Bungalow.

For the bay itself, sleep on the water: an overnight Lan Hạ Bay cruise from Cát Bà costs US$120–250 depending on the boat (Orchid, Heritage Bình Chuẩn at the upper end). One night sleeping on the bay beats three in town.

Food

Cát Bà cha mực (grilled cuttlefish patties) is the local snack. Mussel hotpot (lẩu vạng) is the group dish. The fishing-village seafood is good but priced for tourists; eat where Vietnamese families eat, two blocks back from the harbour.

Honest take

Cát Bà is the more pleasant alternative to a Hạ Long cruise from Tuần Châu, particularly if you like kayaking or climbing. The town itself is dull. Use it as a base, sleep one night on a Lan Hạ boat, and leave. Pair with Ninh Bình for the karst-on-land follow-up.