Piers Koh Samui
1. Leave Samui
Blue Stars and Lomprayah leave Nathon at 08:00, Red Baron leaves Bophut at 08:30 and 100 Degrees East leaves Bang Rak at 10:00. Nathon is about 31 km from the park headquarters in a straight line.
Photo: Urban Diaries
Marine park day trip
Mu Ko Ang Thong
Mu Ko Ang Thong is a cluster of limestone islands west of Koh Samui. The tour from Samui is a long day on a boat deck with two short climbs and a small park fee, so check the calendar first.
The day
Follow the boat across the park
Mu Ko Ang Thong is 42 islands, nearly all uninhabited limestone, and the boats put you ashore on only two. Pick a stop to find it on the map.
| Nathon Blue Stars, Lomprayah | about 31 km |
|---|---|
| Bophut Red Baron | about 40 km |
| Bang Rak 100 Degrees East | about 43 km |
42 islands boats land on 2
Beach Ko Wua Talap
2. Ko Wua Talap
The boats tie up at the park headquarters on Ko Wua Talap, the sleeping cow island: a sand beach under the cliffs and the start of the viewpoint trail.
Viewpoint Ko Wua Talap
3. Ang Thong viewpoint
Above the park headquarters on Ko Wua Talap, sleeping cow island, a short rough scramble ends at a lookout over the whole scattered group of islands.
Viewpoint Ko Mae Ko
4. Thale Nai
Thale Nai on Ko Mae Ko is a saltwater lagoon sealed inside the island's crater. A steep trail climbs to a viewpoint above it; you look down, you do not go in.
Return Koh Samui
5. Back to Samui
Lomprayah is back at 17:00, Blue Stars at 18:00 and Red Baron at 18:30. 100 Degrees East publishes no return time, so ask when you book.
The park
What the boat actually stops for
Two landings, two climbs and a lot of limestone from the deck.
Ang Thong viewpoint
Above the park headquarters on Ko Wua Talap: the lookout over the whole scattered group of islands.
Thale Nai, Ko Mae Ko
A saltwater lagoon sealed inside the island's crater. You look down from the rim, you do not go in.
The other 40 islands
Nearly all of the park is uninhabited limestone: Ko Phaluai and the rest you see from the deck.
Getting there
Four boats, four different days
Two of these publish no price at all, and the park fee usually lands on top of whatever you do pay. Set your group and what matters, and the tickets do the sums.
The park fee
300THB adult150THB child
Paid at the park and usually not folded into the tour price you were quoted. Blue Stars includes it.
Leaves 08:00 Nathon Back 18:00
Blue Stars
Tour boat and sea kayaks
Sails from Nathon with sea kayaks alongside the tour boat, so you can paddle into coves the bigger boats skip. Park fee included, child rate published.
- Adult
- 2,800 THB
- Child
- 1,850 THB
- Park fee
- Included
- Runs
- Daily
2 adults 5,600 THB all in, park fee included
bluestars.info Leaves 08:30 Bophut Back 18:30
Red Baron
Junk-rigged sailing boat
A junk-rigged sailing boat out of Bophut, running two set days a week rather than daily. Slower and quieter than the motor boats, park fee extra.
- Adult
- 3,750 THB
- Child
- 1,750 THB
- Park fee
- Extra
- Runs
- Wed, Sat
2 adults 8,100 THB all in, with 600 THB park fee
Runs Wednesday, Saturday only
redbaron-samui.com Leaves 10:00 Bang Rak No return time
100 Degrees East
Private speedboat
A private speedboat charter from Bang Rak for small groups who want their own schedule. No rate published; ask for a quote and a return time.
- Adult
- On request
- Child
- On request
- Park fee
- Extra
- Runs
- Daily
2 adults Ask for a quote + 600 THB park fee
100degreeseast.com Leaves 08:00 Nathon Back 17:00
Lomprayah
High-speed catamaran
The same high-speed catamaran that runs the ferry routes, chartered for a day trip from Nathon. No price published for this trip online.
- Adult
- On request
- Child
- On request
- Park fee
- Extra
- Runs
- Daily
2 adults Ask for a quote + 600 THB park fee
lomprayah.comOff season
The park shuts for the monsoon
Every year the park closes for several weeks while the seas turn rough, and no operator we found states the dates plainly. Pick a month.
January
Open, calm on the west side
The west coast sea is usually calm this month, the easiest time for the long crossing and the kayaks.
- Park
- Open
- West coast sea
- Calm
- Rain
- 125 mm, 8 days
- Sea
- 28°C
February
Open, calm on the west side
The west coast sea is usually calm this month, the easiest time for the long crossing and the kayaks.
- Park
- Open
- West coast sea
- Calm
- Rain
- 65 mm, 4 days
- Sea
- 28.5°C
March
Open, calm on the west side
The west coast sea is usually calm this month, the easiest time for the long crossing and the kayaks.
- Park
- Open
- West coast sea
- Calm
- Rain
- 115 mm, 5 days
- Sea
- 29°C
April
Open, calm on the west side
The west coast sea is usually calm this month, the easiest time for the long crossing and the kayaks.
- Park
- Open
- West coast sea
- Calm
- Rain
- 85 mm, 6 days
- Sea
- 30°C
May
Open, a choppier crossing
Boats run, but the west coast sea is usually choppy this month: a bumpier ride out and back.
- Park
- Open
- West coast sea
- Choppy
- Rain
- 130 mm, 11 days
- Sea
- 30°C
June
Open, a choppier crossing
Boats run, but the west coast sea is usually choppy this month: a bumpier ride out and back.
- Park
- Open
- West coast sea
- Choppy
- Rain
- 135 mm, 10 days
- Sea
- 30°C
July
Open, a choppier crossing
Boats run, but the west coast sea is usually choppy this month: a bumpier ride out and back.
- Park
- Open
- West coast sea
- Choppy
- Rain
- 115 mm, 11 days
- Sea
- 29.5°C
August
Open, a choppier crossing
Boats run, but the west coast sea is usually choppy this month: a bumpier ride out and back.
- Park
- Open
- West coast sea
- Choppy
- Rain
- 100 mm, 10 days
- Sea
- 29.5°C
September
Open, a choppier crossing
Boats run, but the west coast sea is usually choppy this month: a bumpier ride out and back.
- Park
- Open
- West coast sea
- Choppy
- Rain
- 120 mm, 11 days
- Sea
- 29°C
October This month
Open, last weeks before the closure
The west coast sea turns rough in October and the park shuts about 1 November. Book early in the month and keep a spare day.
- Park
- Open
- West coast sea
- Rough
- Rain
- 295 mm, 16 days
- Sea
- 29°C
November
Closed for the monsoon
The park closes from the start of November every year while the seas turn rough. No boats land.
- Park
- Closed
- West coast sea
- Rough
- Rain
- 445 mm, 16 days
- Sea
- 29°C
December
Closed until about mid month
The park reopens around the middle of December; the exact date shifts with how rough the sea still is, so check with an operator first.
- Park
- Closed to about 15 Dec
- West coast sea
- Calm
- Rain
- 265 mm, 12 days
- Sea
- 28.5°C
The park is closed from the start of November to the middle of December each year; the exact reopening shifts with how rough the sea still is. Sea state from our own coast-by-month table; rain and sea temperature are long-term monthly averages.
FAQ
Questions about the trip
Can you swim in the lagoon at Thale Nai?
No. The trail only takes you to a viewpoint above the lagoon on Ko Mae Ko. Swimming and boats inside it are not allowed; you look at the water from above and walk back down.
Is the park fee included in the tour price?
Usually not. Most operators quote the boat price and collect the park fee separately once you land, so budget for it on top of whatever you paid to book.
Which boat should I book if I want a price up front?
Blue Stars and Red Baron publish a price. The private speedboat charter and the catamaran trip do not list a rate online, so you would need to ask them directly.
Why is Ang Thong Marine Park closed, and when?
The park closes every year from early November into mid December for the monsoon. The reopening date moves with sea conditions, so check with an operator before planning a trip in that window.
How long is the day trip?
Most boats leave Samui in the morning and return in the late afternoon or early evening. One charter operator does not publish a return time at all, so confirm it when you book.
Plan the rest of the day
Read the full write-up on the viewpoint trail, or line the trip up against our other day trips and island-hopping notes before you book.
Checked 12 September 2026
Prices, schedules and the park fee change; checked against the national park and each operator's own site, not against resellers.