Cù Lao Chàm — known in English as Cham Island — is the eight-island archipelago that sits eighteen kilometres east of Hoi An's coast, inside what UNESCO designated a Marine Biosphere Reserve in 2009. Hòn Lao, the largest of the eight, is the only one with permanent residents — about three thousand people, mostly fishing families. The other seven are uninhabited and protected. For the day-tripper from Hoi An, the appeal is simple: it is the closest piece of authentically empty Vietnamese coastline, with the cleanest snorkelling reef within a reasonable distance of the Ancient Town, and a fishing village that still works the way fishing villages have worked here for several hundred years.
The trip starts at Cửa Đại pier, twenty-five minutes by car east of Cẩm Nam. Speedboats leave between 07:30 and 08:30, depending on tide and season, and the crossing takes thirty to forty minutes. The boats are loud, the sea between Hoi An and Cù Lao Chàm can be choppy in winter, and motion sickness is common — take a Dramamine or its local equivalent the night before if you are sensitive. From May through August the seas are flat and the crossing is calm. From September through April the conditions vary; in October and November the boat service is sometimes suspended for days when typhoons close the coast.
What you actually do on the island
Most day tours follow the same loop: an hour or two of snorkelling at one of three reef sites (Bãi Bìm, Bãi Xếp, or Hòn Lá depending on conditions), a stop at the Hải Tạng pagoda and the small Cham Island Marine Protected Area museum, lunch in the fishing village of Bãi Làng, and a couple of hours on the beach at Bãi Chồng before the boat returns at three or four in the afternoon. The reef itself is the main attraction. Visibility is consistently around eight to twelve metres, the coral is healthy by the standards of any reef accessible from a Vietnamese port city, and there are typically a few small reef sharks and large schools of fusiliers. Bring your own snorkel mask if you have one — the rental gear varies wildly in quality.
The pagoda visit is fine but brief. The marine museum is small and explains the conservation effort that has made this reef one of the few healthy ones in central Vietnam: a strict no-plastic policy on the island (you cannot bring single-use plastic ashore), a rotating fishing-zone restriction, and a 4 USD reserve entry fee that funds local conservation. The fishing village lunch — usually at one of three or four family-run restaurants — is built around grilled fish caught that morning, salt-and-pepper squid, and morning glory stir-fried with garlic. It costs about 200,000–300,000 VND per person and is more interesting than the beach-restaurant food you can get in Hoi An.
The structural insight: the island rewards travellers who treat it as a serious day rather than as a beach extension. The reef is the reason to come; the village is the reason to stay an extra hour past the standard tour bracket.
Booking, pricing, and the boat reality
A standard group day tour costs between 600,000 and 900,000 VND per person, including transfer, boat, snorkel kit, lunch, and the reserve fee. A private speedboat for four to eight people costs around four million VND for the same itinerary, which is much better if you want to control timing or spend longer in the water. Most Cẩm Nam-side hotels (including ours) can arrange both; otherwise the booking offices along Trần Phú street in the Old Town are reliable. Avoid booking from the cyclo-driver guides on the street — the price they quote often becomes higher once the boat leaves.
High-season weekends (June through August) get crowded; expect three or four group boats unloading at the same beach simultaneously. Tuesdays and Wednesdays in the shoulder months (March, April, September) are the quietest days and the snorkelling visibility is usually best then.
Staying overnight
About a dozen homestays operate on Hòn Lao, most of them basic — a fan room with a shared bathroom, a family meal, perhaps a hammock on a porch. The two reasons to stay are the night sky (the island has minimal light pollution and on a clear new-moon night the Milky Way is visible) and the dawn fishing trip with one of the village's working fishermen, which can be arranged by your homestay host. Bookings are best made through Booking.com or Vietnamese OTAs; the homestays do not all have English-language websites.
For most visitors, however, a day trip is the right format. Returning to Cẩm Nam by late afternoon, your spa is hot, your room is quiet, and the contrast between the salt-water exhaustion of the boat and the herbal bath that follows is itself part of the appeal of staying at a riverside hotel within twenty-five minutes of the dock.
Practical matters
Bring reef-safe sunscreen — the marine reserve requests it and the strict version of the rule is enforced at the no-plastic checkpoint. Cash is essential; the island has one ATM that is unreliable. Mobile signal is spotty on the boat and patchy in the village. The reserve entry fee is currently 70,000 VND; the no-plastic rule is enforced — bring a refillable bottle. Save the boat ticket — the same one is checked on the return crossing.
From Nghê Prana, the trip is twenty-five minutes by car to the pier, eight to nine hours total round-trip, and pairs naturally with a quiet day before and a recovery day after. We can arrange the transfer and the tour booking; the village in Cù Lao Chàm rewards travellers who arrive with realistic expectations and leave before the day boats unload at three in the afternoon.