When a private boat trip from Koh Lanta makes sense

Most island days from Koh Lanta can be done two ways: on a joined tour, sharing a boat and a fixed programme with other travellers, or on a private boat that carries only your group. The islands are the same. What changes is who sets the clock, how the cost is split and, if you choose a longtail, how far you can sensibly go. This guide helps you decide before you ask anyone for a quote.

Koh Lanta Yai to Koh Rok

about 26 km

Speedboat to Koh Rok

about 1 hr

Longtail to Koh Rok

about 2 hr

Offshore park fee

400 THB per foreign adult

Distance and times from Thai National Parks (as of June 2026); fee from the Department of National Parks table cited by Thailand Tested, checked 18 October 2026.

Private boat trip or shared tour from Koh Lanta at a glance

A shared tour wins on price for one or two people and does the planning for you. A private boat wins on control. The table sets out the trade.

	Private boat	Shared (joined) tour
Who is aboard	Your group only	Other travellers too
How it is priced	Per boat	Per person
Route and stops	Agreed with you, within conditions	Fixed programme
Time at each stop	Flexible	Set by the schedule
Start time	Can be earlier or later	Set departure
Pace for children or older travellers	Yours	The group’s
Usually best for	Families, friends, special interests	Solo travellers, couples, first-timers

What is included (lunch, snorkel gear, water, transfers) varies on both formats, so compare like with like. Our Koh Lanta boat tours page shows the routes offered both ways.

Is a private boat trip worth it compared with a shared tour?

It is worth it when your group is close to the break-even size, or when flexibility is the reason you are going. The cost logic is simple. A joined tour charges each person; a private boat charges for the boat. So divide the boat price by the joined price per person. Say a private boat costs about the same as six joined seats. A group of six then pays roughly the same either way and a group of eight pays less each. A couple pays three times as much per head.

Then adjust for what is not the same. A joined tour may include lunch, snorkel gear or a pier transfer that a private quote lists separately, or the other way round. National park fees are charged per person whichever boat you use, so they do not change the comparison. Ask whether they are inside the price.

Beyond the money, a private boat earns its cost in these situations:

• Young children: you can keep crossings short, stop for naps and turn back early.
• Older travellers or limited mobility: more time to board and land, no one waiting.
• Seasickness: a shorter route, a calmer start time and the option to cut the day short.
• Photography: you choose the light, and you can stay at a stop after the tour boats leave.
• Tide-dependent stops: the Emerald Cave on Koh Mook depends on the tide and sea state, so timing helps. Our Emerald Cave guide explains why.
• Mixed interests: some want to fish, others to snorkel.

A joined tour is the better choice if you are travelling alone or as a couple, want everything arranged, or are happy with the classic routes compared in our Koh Rok, 4 Islands or Phi Phi guide.

Private longtail or private speedboat for the day

Choose the boat around the route, not the other way round. A longtail is a wooden hull driven by a car-type engine on a long propeller shaft that the driver swings to steer. It is lower, slower and more traditional. A speedboat covers distance faster, which matters most for offshore islands.

	Private longtail	Private speedboat
Speed	Slower; Koh Rok about 2 hr	Faster; Koh Rok about 1 hr
Ride in a chop	Low, with spray	Quicker, but can slam
Engine noise	Loud, close to you	Varies with the boat
Shade	Often a canopy; ask	Often a canopy; ask
Suits	Nearby islands, coast, sunset, fishing	Koh Rok, Koh Haa, longer days

Times from Thai National Parks; other rows are general, so check the actual boat.

Can a longtail reach Koh Rok in a day?

Sellers disagree, and both sides can be right on different days. Thai National Parks gives about 2 hours each way by longtail and does not recommend it. Four things decide it:

1. Where you leave from. Thai National Parks puts Koh Rok about 26 km south of Koh Lanta Yai, which fits a start from the southern end. Using OpenStreetMap coordinates, it is about 28 km in a straight line from Laem Tanod at the southern tip but about 48 km from Saladan pier in the north. At the pace implied by a 2 hour, 26 km crossing, a start in the north could mean more than 3.5 hours each way.
2. Sea state. The run is open water. On 18 September 2026 the Thai Meteorological Department told small boats in the Andaman Sea to stay ashore for three days.
3. The boat. Hull size, engine and load all change speed and comfort.
4. Park rules. Koh Rok is in Mu Ko Lanta National Park. For 2026 it was scheduled closed from 1 June to 30 September, and the offshore zone fee is 400 THB per foreign adult.

If the longtail feel matters more than reaching Koh Rok, nearer routes such as the 4 Islands make a fuller day. For Koh Rok itself, see our Koh Rok and Koh Haa tour.

Fishing, snorkelling and a Koh Lanta sunset boat trip

A private boat is the usual way to combine activities, with one limit. Section 19 of the National Park Act 2019 bans taking wild animals and bringing tools for catching animals into a national park unless officials permit it. The best snorkelling sites lie inside parks, so fishing and snorkelling may happen in different places on the same day. Our article on what a fishing trip from Koh Lanta involves goes into the detail. Leave sunscreens with oxybenzone, octinoxate, 4MBC or butylparaben at home; a 2021 park notification bans them in marine national parks.

Sunset trips suit a longtail well because the distances are short. Koh Lanta’s west coast faces the open Andaman Sea. Calculated sunset times for the island (Sunrise-Sunset.org) are:

• mid-November about 18:03
• mid-December about 18:11
• mid-January about 18:26
• mid-February to mid-March about 18:36
• mid-April about 18:34

Civil twilight adds about 20 minutes, so you come back in the dusk. Ask where you board, where you land and what time you return.

Questions to ask before booking a private boat

Whoever you book with, these answers tell you what you are paying for:

• Route: which islands, in what order, and where the boat leaves from.
• Time on the water: total hours, and how long each crossing takes.
• The boat: longtail or speedboat, size and how many it seats comfortably.
• What is provided: snorkel gear, fishing gear, drinking water, lunch.
• Life jackets: enough for everyone, including child sizes.
• Shade and toilet: is there a canopy, and is there a toilet on board.
• Weather policy: who decides on the day, and whether you rebook or are refunded.
• Fees: which park fees apply, and whether they are in the price.
• Getting there: how you reach the boarding point.

What to send us for a private boat quote

We arrange boat and snorkel tours with joined and private, longtail and speedboat options across the boat services we arrange, and private boats for island hopping, fishing and sunset, with fishing equipment available. See our private boat trips page, then message us with:

1. Your date and a back-up date.
2. Your hotel or area on Koh Lanta.
3. How many adults and children, with children’s ages.
4. What you want from the day: islands, snorkelling, fishing or sunset.
5. Anyone prone to seasickness or with limited mobility.

We reply with what is possible on your date, the boat, the route, the timing and the price, and you can ask us to quote a joined tour alongside to compare.