Boat Tours Compared
from Koh Chang

The island-hopping snorkeling tour around Koh Chang is the best-value boat trip if you want to see several sides of the Trat sea in one day without a long ride out to the outer islands. The boat departs from a pier on the western side of Koh Chang and loops into Mu Ko Chang National Park, stopping at around 3-5 snorkeling spots, such as around Koh Rang, Koh Wai, and the Koh Yak Yai-Yak Lek islands. Each spot has shallow coral where you can float and watch schools of fish without needing to be a strong swimmer. Compared with the Koh Kood or Koh Mak trips, which involve longer boat rides and higher prices, this tour takes less travel time and focuses mainly on getting in the water to see coral — making it a good fit for anyone who wants the core snorkeling experience on a modest budget.

Large join-group boat tours are popular because the per-person price is affordable, life jackets are provided for everyone, and it suits families with children or adults who aren't strong swimmers. The price usually includes lunch, fruit, drinking water, and snorkeling gear, and many operators offer pickup from west-coast resorts. Booking ahead through an online platform lets you compare what's included, how many stops there are, and whether it's a 3-island or 4-5-island program. The national park entrance fee is usually charged separately from the tour price, with different rates for Thai and foreign visitors, so it's worth setting aside cash for that. The clearest water and best snorkeling conditions are during the dry season, roughly November to April, while during the monsoon the seas are rougher, visibility drops, and some operators stop running.

To be upfront about what to expect before booking: around midday, many tour boats tend to converge on the same spots at once, so some sites get crowded and the water gets stirred up and cloudy. Some reef areas show signs of bleaching and damage from weather and heavy use, so avoid stepping on or touching the coral, and use reef-safe sunscreen. Reaching the first stop early, before the other boats arrive, means clearer water and fewer people. If you're prone to seasickness, take motion-sickness medication in advance and sit toward the middle of the boat. Bring a long-sleeve rash guard, a hat, and shoes you don't mind getting wet, and you'll be comfortable all day.

Koh Kood is Trat province's second-largest island after Koh Chang, sitting at the far end of the eastern seaboard near the Cambodian border. It's known for emerald-green clear sea water, fine white sand beaches, and a peaceful atmosphere that's still less crowded than Koh Chang. Most day-trip tours to Koh Kood depart from piers on the Trat mainland, such as Laem Sok or Laem Ngob, with a fast boat crossing taking around one to one-and-a-half hours. A typical program includes swimming at beautiful beaches, snorkeling to see coral and fish at clear-water spots, a stop at Klong Chao waterfall — a large waterfall in the forest with a pool for freshwater swimming — and finishes with lunch before the boat back. What sets Koh Kood apart from the island-hopping snorkeling trip is water clarity that many rate as superior, and beaches that are noticeably quieter.

Reviewers consistently point to the clarity of the sea water and the beaches' unspoiled natural feel. Many say the water is so clear you can see the sandy bottom and schools of fish distinctly, making it great for snorkeling and photos. Klong Chao waterfall is the on-land highlight, offering a change of pace from the sea to a cool freshwater soak in the forest. Going as part of a bundled boat tour removes the hassle of finding a boat, working out schedules, and getting around the island yourself — which can be tricky since Koh Kood is large and its attractions are spread far apart. Koh Kood's overall Tripadvisor rating sits high at around 4.6 out of 5 from several hundred reviews, reflecting that most visitors come away impressed with the island's natural scenery.

To be upfront about what to expect before booking: first, Koh Kood is far away — the fast boat crossing takes a while and can hit rough waves on some days, so anyone prone to seasickness should bring medication. If departing from Koh Chang, you'll need to sail back to the Trat mainland first and then take another boat to Koh Kood, adding significantly to total travel time. Second, many reviewers say Koh Kood suits an overnight stay better than a single day trip, since by the time you arrive and actually get in the water, there's not much time left before you have to rush back for the return boat. Third, boat and tour costs run higher than the island-hopping snorkeling trip due to the greater distance and fuel costs. Finally, on seasonality: during the monsoon period roughly May through October, winds and waves pick up, many fast-boat operators cut back their schedules or stop running, and some resorts on the island close for the season. Always check the weather and confirm boat schedules with the operator before traveling.

Koh Mak is a mid-sized island in the Trat sea, sitting between Koh Chang and Koh Kood. Its standout feature is being flat, with no steep hills like Koh Chang, which makes cycling or riding a scooter around the island easy and pleasant. Many of its beaches have shallow, clear water, ideal for wading in without needing to go far out. The overall vibe is peaceful, with small resorts scattered around and no lively nightlife scene. Most single-day Koh Mak tours travel by speedboat from a pier on the Trat mainland, taking around 45 minutes to an hour. A typical program includes beach swimming, snorkeling, time to cycle or walk around the island, and lunch before the boat back. Compared with Koh Kood, which sells the drama of crystal-clear water and a waterfall, Koh Mak markets itself more on being a small, peaceful island that's easy and relaxed to explore.

Reviewers consistently point to the island's calm and friendliness. Many say Koh Mak suits anyone wanting to escape the hustle, lie on a quiet beach, cycle along coconut groves, and enjoy an uncrowded island feel. The shallow beaches make it reassuring to bring children or less confident swimmers into the water. Koh Mak is also known as an island where the local community and businesses have pushed for eco-friendly tourism. Koh Mak's overall Tripadvisor rating sits at a solid 4.5 out of 5 from a few hundred reviews, with most feedback praising the calm, the beautiful beaches, and the friendly locals.

To be upfront about what to expect before booking: first, Koh Mak is fairly far from Koh Chang — departing from Koh Chang means sailing back to the Trat mainland first, then taking another boat to Koh Mak, which adds up to considerable travel time for a single-day trip. Second, the quiet that's the main selling point is a double-edged sword — anyone who likes lively activities, lots of shops, or nightlife may find Koh Mak too quiet with little to do. Third, a single-day visit leaves limited time on the island; many say Koh Mak suits an overnight stay better, so you can cycle, watch the sunset, and fully soak in the calm. Finally, on seasonality: during the monsoon period roughly May to October, winds and waves pick up, many boat operators cut back schedules or stop running, and some resorts close for the season. Always check the weather and confirm boat schedules before traveling.

The HTMS Chang is a large decommissioned warship that was sunk to form an artificial reef off the southern coast of Koh Chang, and it has become one of Thailand's largest wreck dive sites and a highlight for wreck divers. This trip differs from the other three routes in that it's a deep dive using a real air tank, not snorkeling at the surface. The ship rests at various depths, and divers can explore the deck, the bridge, and the ship's structure as it gradually becomes covered in coral and marine life. Schools of fish are commonly seen gathering around the wreck. Several dive shops on Koh Chang run 2-dive packages that include gear and round-trip boat transport.

For those without certification who still want to try, many shops offer a Discover Scuba Diving program, letting first-timers dive under close instructor supervision at a limited depth — making it an accessible entry point into deep diving from Koh Chang. Divers with an Open Water certification or higher can dive deeper and explore the wreck more fully. What clearly sets this trip apart from snorkeling trips is the feeling of actually being underwater among the structure of a large ship — an experience snorkeling simply can't offer. Underwater visibility and the abundance of fish are best during the dry season, roughly November to April.

To be upfront about what to know before booking: first, this is deep diving, with health and fitness requirements — people with certain medical conditions or who have just flown may not be able to dive, so fill out the health questionnaire honestly and consult the shop beforehand. Second, underwater visibility here isn't always crystal clear — some days the water is cloudy from sediment and currents, especially after rain or during monsoon season, making the wreck harder to see than expected. Third, the wreck sits in deep water with occasional currents, so dive with a shop that has solid safety standards and instructors familiar with the site, and never dive beyond your certification level. Finally, the price is noticeably higher than snorkeling trips since it involves more equipment and instructors — compare whether the price fully includes gear and how many dives are included before booking.