Krabi Plankton Tours: The 15 Best Night Swims in the Glow

1.Krabi 4 Island Sunset Snorkeling Cruise + Bioluminescent Swim

★★★★★★★★★★5.0 · 1,861 reviews · from $130Our pick

Set out from Ao Nang or Railay on a traditional wooden junk for island stops, snorkeling, kayaking and paddleboarding. The crew, including owner Michael and snorkeling guide Z, provides gear, snacks and a Thai buffet. After sunset, swim at Phra Nang Cave Beach and watch bioluminescent plankton sparkle around you.

“Krabi Sunset Cruises was an amazing experience!!! Michael and his crew were incredible and provided a unique fun-filled journey for everyone!!!!”

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2.Bioluminescent Plankton, Snorkeling & Sunset Tour

★★★★★★★★★★4.3 · 863 reviews · from $40

This six to six-and-a-half-hour Krabi boat tour visits Tup, Chicken and Poda islands, with snorkeling, a beach BBQ and a nighttime search for bioluminescent plankton. Hotel transfers, gear, drinks and an English-speaking guide are included. Guides such as M, Selina and Pichi have earned praise for keeping the trip friendly and well run, though the plankton and sunset depend on conditions.

“We really enjoyed this tour, we visited great islands, snorkelled with amazing fish and watched the sunset on a great beach! There is plenty of time at all the stops and the tour is a perfect length. Our guides were all really nice! The boat wasn’t too crowded / the islands weren’t too busy! Dinner was very good, lots of options and plenty of food! The plankton was an unexpected highlight :)”

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3.7 Islands Sunset Tour with Plankton Swim and BBQ

★★★★★★★★★★4.0 · 808 reviews · 7 hours · from $49

Spend seven hours island-hopping by long-tail boat or speedboat, with snorkeling at Chicken Island and Koh Tan Ming, a beach BBQ at Phra Nang, and a night swim for bioluminescent plankton. Hotel pickup, a guide, fruit, drinks, and snorkel gear are included. The plankton can be faint, so time your trip for a dark, moonless night.

“Everything with this tour was great. We loved it. Thank you”

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4.From Phi Phi Island: Maya Bay Sunset & Plankton by Speedboat

★★★★★★★★★★4.6 · 555 reviews · from $46

This half-day speedboat trip from Phi Phi Island visits Monkey Beach, Pileh Lagoon, Viking Cave, and Maya Bay, with reef snorkeling, sunset views, and a final swim among glowing plankton. Guides including Coco, Adam, and Courtney have led trips, and the crew supplies snorkeling gear, fruit, water, and soft drinks. Maya Bay access and sea conditions can affect the route.

“it was wonderful day. you absolutely need try this. Thanks to crew 🖤”

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5.Railay Phra Nang & Diamond Cave Sunset Plankton Tour

★★★★★★★★★★4.5 · 373 reviews · 5 hours - 390 minutes · from $28Best value

Cruise from Krabi to Railay, walk to Phra Nang Cave, explore Diamond Cave and spend free time by the beach before sunset. The return boat stops for a chance to see bioluminescent plankton in the Andaman Sea. Guides include Jess, Peter, Leen and Nina, though your guide depends on the departure.

“It was very impressive to see the plankton. It’s really worth it to jump in the water in order to see them better!”

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6.Phi Phi: Maya Bay, Bamboo Island & Plankton Full-Day Tour

★★★★★★★★★★4.6 · 255 reviews · 9h 30m · from $69

This 9.5-hour speedboat trip visits Maya Bay, Pileh Lagoon, Viking Cave, Monkey Bay and Bamboo Island, with snorkelling stops, lunch and an after-dark plankton swim. English-speaking guides, including crew members known as Solomon and Coco Loco, lead the day. The 400-baht national park fee, masks, life jackets, food and water are included.

“Even on a stormy monsoon day this tour was excellent. 100% recommend the speedboat across the straight to Maya Bay and surrounds - a lot of long tails were struggling, and one sank. Our tour guide was a lovely local with so much pride for his culture and a lovely funny host. great snorkeling - we saw reef sharks, Moray eels, monkeys and bioluminescent plankton. Thanks to all for a great day!”

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7.7 Islands Sunset Hopping Cruise with BBQ & Plankton

★★★★★★★★★★4.4 · 250 reviews · from $37

Start with hotel pickup around noon, then explore Krabi’s island coast by speedboat, with stops that may include Phra Nang, Thale Waek, Chicken Island, and Poda. Expect snorkeling, fruit and drinks, a BBQ dinner at sunset, and a final chance to see bioluminescent plankton. Guides such as Jess, Palm, Bee, and Peter have led tours.

“Great, guide was so friendly and made sure everyone was okay!”

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8.4 Islands Sunset + Plankton, Semi-Private Tour only 12 Guests

★★★★★★★★★★5.0 · 166 reviews · from $81

Spend about seven hours exploring Poda, Tup, and nearby islands by speedboat, with beach time, snorkeling, a traditional Thai lunch, and a night swim for bioluminescent plankton. The group is limited to 12, with hotel transfers, a guide, drinks, fruit, and snorkeling gear included. Guides Hat and Joy have been praised for keeping the trip fun and well organized.

“We are so glad we did this sunset tour, Hat and the team were welcoming, fun and informative. Plenty of food and drink was provided throughout the afternoon. The time spent in each place was perfect for us, and snorkelling at night with bioluminescent plankton was an experience we won’t forget.”

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9.Krabi 7 Islands Snorkeling & Plankton Night by Big Longtail Boat

★★★★★★★★★★4.0 · 164 reviews · from $52

Spend an afternoon and evening by big longtail boat among seven Krabi islands, with snorkeling stops, the Tup and Mor sandbar, dinner near sunset, and a nighttime swim for bioluminescent plankton. Masks, life jackets, food, and transfers from Krabi Town and Ao Nang are included. Expect a group of up to 30, changing sea conditions, and a long day out.

“We had a great time - appreciate that they had vegetarian food options. Enjoyed the bioluminescent plankton a lot!”

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10.Bio Luminescent Swimming From Krabi

★★★★★★★★★★3.5 · 85 reviews · from $43

Start around 2 pm with hotel pickup from Krabi Town or Ao Nang, then visit six island stops for snorkeling, beach time and sunset. After dinner, take a longtail boat to Koh Daeng for a night swim with bioluminescent plankton. Gear, life jackets, drinking water and a guide are included. The plankton can be faint, so treat it as a bonus, not a guaranteed light show.

“Great value for money. Some beaches were a bit crowded, but the tour was well organised. Nice food and highlight was sunset at the beach. For bio plankton I recommend jumping into the water when boat stops to swim as that’s when you can see so many of them!”

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11.Railay Beach Bioluminescent Plankton Ferry Cruise

★★★★★★★★★★3.7 · 60 reviews · 3 hours · from $41

Leave Ao Nang Beach by boat at 5 pm for Railay, where you have time to enjoy the sunset and explore the shore before a night swim and a chance to see bioluminescent plankton. English- and Malay-speaking guides lead the group. Snacks, snorkel gear, life jackets, and the national park fee are included.

“Punctual organization; Speedboat transfer; Time (1.5hrs) to walk railay islands; Nice sunset - lots of tourists (peak season) ; Short plancton stopp with swimming ( boat large enough to change clothing) ; Easy to find starting point; Expect to get wet when boarding the boat. Expect to see only some plancton as ot rately gets dark arpund ao nang”

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12.Railay Sunset and Bioluminescent Plankton Tour

★★★★★★★★★★3.9 · 55 reviews · 3 hours - 210 minutes · from $31

Join an English- or Thai-speaking guide for an evening longtail boat trip from Ao Nang to Railay Beach. Relax, swim and watch the sunset before heading out after dark to look for bioluminescent plankton. Snacks, fruit, drinks, life jackets and travel insurance are included. The plankton’s glow varies with the conditions.

“Everything was very rushed and we left about 30min late due to some late passengers. The boat look ok but the steps are not safe and the guy supposedly helping people in and out was not that bothered. I ended up slipping and hurting my foot and not even an apology or a "are you ok?". Railay is obviously nice but too crowded with boats and people and the planktom is hit and miss. There are many others beached in thailand and even in Krabi that will be better”

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13.Hong Islands Sunset, Bioluminescent Plankton and BBQ

★★★★★★★★★★4.3 · 41 reviews · 5 - 7 hours · from $54

Spend an afternoon among Hong Island, Ko Lao Lading, and Ko Pak Bia by speedboat or traditional longtail. Swim, snorkel, watch the sunset, and eat a mini-buffet BBQ on the beach before looking for glowing plankton. A Thai-, English-, or Malay-speaking guide accompanies the tour. Plankton sightings depend on natural conditions.

“I had an amazing time. The tour guide was friendly and enthusiastic. The views were breathtaking and the food was delicious. We did expect to be dropped off as we were picked up but they only told us when we came back from the activity that they aren’t doing drop off today. Other than the drop off situation we had a good time”

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14.Hong Islands Sunset & Glow Plankton Night Trip from Krabi

★★★★★★★★★★4.0 · 32 reviews · from $52

This 7 to 8 hour trip from Krabi combines Hong Island beach time, a viewpoint climb, a longtail ride into the lagoon, beach dinner and a night swim among bioluminescent plankton. Transfers from Krabi Town and Ao Nang, a guide, snorkel gear, drinks and fruit are included. Guides Bay and Santana have been named on a departure, but staffing can vary.

“All amazing. Beaches, snorkeling, photos, food... All very professional. The guides Bay and Santana very attentive with everythingAuto-translated”

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15.Krabi 7 Islands Snorkeling, Sunset Dinner & Plankton Night

★★★★★★★★★★4.0 · 23 reviews · from $45

Set off from Ao Nang at 1 pm for seven island stops, snorkel among tropical fish, walk a tide-dependent sandbar, and eat dinner on Poda Island before a night swim in search of glowing plankton. Hotel pickup is offered in Krabi Town and Ao Nang. The group is capped at 25; guides have included Nicky, praised for a funny, accommodating style.

“The pickup truck came late. The driver said that he had to stop by other people. We visited many shallow dives. There are a lot of fish here. The barbecue on the beach is delicious. Very beautiful and beautiful sunset. Plankton is interesting. Read more”

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