Iwahig firefly watching: is it worth it?
This is the best-value thing in Puerto Princesa and the one nobody plans for. A paddle bangka carries two to four of you plus a boatman along about 1.2 km of mangrove, the guide runs a star talk on the way, and on a dark night the paddle strokes light up with bioluminescent plankton. It costs ₱1,200 (~$21) without dinner and ₱1,300–1,700 with, pickup is 17:30–18:30 and you are back by 21:00–22:00 — which means it stacks on top of any day tour you have already booked. It rates 4.1/5 across 891 TripAdvisor reviews and 4.7★ on Klook. Only 30 to 45 minutes of the evening is actually on the water.
Four hours, of which forty minutes matter
Like everything in this city the ratio is unflattering and the forty minutes are still worth it.
Pickup at your hotel is 17:30 to 18:30, then 30 to 45 minutes south to the Iwahig river mouth. If you booked the dinner version you eat at the riverside buffet at the ecotourism park first. Then you are handed a life vest and put into a paddle bangka — two to four passengers plus a boatman, no engine — for 30 to 45 minutes along roughly 1.2 km of mangrove and back. Home by 21:00 to 22:00.
The fireflies live in specific trees rather than swarming across the river, and the boatman knows which ones. A good guide will hold the boat under a lit tree long enough for your eyes to adjust, then push out into the middle of the channel and run a constellation talk, which sounds like filler and consistently is not — reviewers mention it as often as the fireflies.
The bonus, when conditions allow, is bioluminescent plankton in the water itself: the paddle blade lights up, and trailing a hand over the side does the same. It is seasonal and condition-dependent rather than guaranteed, which is why GetYourGuide sells a specific seasonal plankton variant rather than promising it on every product.
Every way to book it, priced
The local no-dinner price is the number to judge everything against. What the platforms sell you on top of it is hotel pickup you can rely on and a cancellation policy that survives a rainy afternoon.
| How you book | Price | What it includes | Verdict |
|---|---|---|---|
| Local operator, no dinner booked through your hotel front desk | ₱1,200 ~$21 | Transfers, boat, guide. Eat in the city afterwards | WORTH IT |
| Local operator with dinner riverside buffet at the ecotourism park | ₱1,300–1,700 | Transfers, buffet, boat, guide | WORTH IT |
| Klook firefly tour 4.7★ — the highest rating of any evening product here | $29.25 ~₱1,700 | Transfers, boat, guide, usually dinner | WORTH IT |
| GetYourGuide with dinner 4.3–4.5★ across 214 and 64 reviews | from $28–35 | Transfers, buffet, boat, free cancellation | WORTH IT |
| GetYourGuide seasonal plankton variant sold as a separate product, not a promise | see live price | Same evening, timed for plankton conditions | DEPENDS |
| Underground River plus fireflies, same day 4.5★ from 129 reviews | $84 | One 14-hour day, two headline acts, one van | DEPENDS |
| Kitu-Kito / Nagsaguipi River the competing site, same concept | cheaper, varies | A different river, usually a shorter transfer | DEPENDS |
| Going on a full moon whatever the price | any | The moonlight washes out both the fireflies and the plankton | SKIP |
Prices checked August 2026. The ₱150 city environmental fee is not charged again for this tour if you already paid it at Honda Bay or the Underground River — keep the receipt.
The single decision that matters
Pick your night by the moon phase and nothing else. This is the one piece of planning advice on this page that changes the outcome.
Go on or near a new moon. Fireflies are competing with ambient light, and so is the plankton — both need genuine darkness. On a bright full moon you will still take the boat ride, the guide will still be good, and you will see a fraction of what the reviews describe. Bloggers who rave about this trip almost all did it on a calm, moonless night.
Rain kills it too, for the same reason plus the obvious one. If your evening is wet, most operators will move you rather than refund you, so ask what the policy is before you pay — see the complaints section below for why that matters. The wet months here are June to October, with October the wettest at 266 mm across 21 rainy days; the month-by-month page has the rest.
There is no closed season for the fireflies themselves. What varies is how many you see, and the honest expectation to set is fireflies lighting individual trees, not a synchronised swarm. Nobody who arrived expecting a Malaysian mangrove spectacle came away satisfied.
The etiquette, which is enforced
Flash disorientates the fireflies and ruins the dark adaptation of every other person in the boat. Phone night modes do not work here either — accept that you are not photographing this and put it away.
The boat passes close enough to reach the branches and the colonies live on them. Hands inside the boat.
Screen brightness at the lowest setting, or off. A single bright screen in a four-person bangka costs everyone their night vision for several minutes.
A June 2025 reviewer sat through a passenger FaceTiming on speaker for the length of the paddle. Do not be that passenger.
You are sitting still in a mangrove at dusk. This is the one tour in the city where the mosquitoes are a real consideration.
The ₱150 environmental fee, tips for the boatman and anything you buy at the park are cash. There is no ATM at the river.
What goes wrong, printed honestly
This is the best-reviewed evening in the city and it still has a 4.1, not a 4.8. Here is what sits behind the missing stars.
Operators run the tour when there is nothing to see. An August 2023 reviewer counted roughly ten fireflies across the whole paddle and called it scandalous that the trip runs regardless. That is the structural risk: the boat goes out whatever the moon is doing, because the boat going out is the product.
Refunds are not reliable. A September 2025 reviewer was promised a refund and then, in their word, ghosted. Book through a platform with a written cancellation policy if that prospect bothers you — this is the specific case where paying $28 instead of ₱1,200 buys you something real.
Some boatmen force the plankton. A June 2025 reviewer described the crew beating the boat with oars to stir the plankton into lighting up. It is not the norm and it is not what the ecotourism park teaches, but you should know it happens, and you are entitled to ask them to stop.
None of that changes the verdict. It rates 4.1/5 from 891 reviews and sits at #5 of 59 things to do in the city, and the raves are specific rather than generic — the largest amount of fireflies ever seen on mangroves (November 2024), the darkness, the silence, and the lights (July 2023). Book the right night and it delivers. Read the corpus yourself on TripAdvisor.
The practical bit
Where to book the evening
Local operators sell this at ₱1,200 without dinner, so a platform listing at $28–35 is roughly the with-dinner local price. What the extra buys is a cancellation policy, which on this specific tour is worth having.
Firefly questions, answered
Is the Iwahig firefly tour worth it?
Yes, and it is the best-value evening in the city at ₱1,200 (~$21) without dinner. It rates 4.1/5 across 891 TripAdvisor reviews and 4.7★ on Klook, and because pickup is 17:30 it stacks on top of a day tour rather than costing you a day. Go on or near a new moon.
What is the best time to see fireflies in Puerto Princesa?
On or near a new moon, on a night with no rain, with pickup at 17:30–18:30. There is no closed season, but a bright full moon washes out both the fireflies and the bioluminescent plankton. Only 30 to 45 minutes of the 3.5–4 hour evening is on the water.
How much is the Iwahig firefly tour?
₱1,200 (~$21) per person without dinner from local operators, ₱1,300–1,700 with the riverside buffet. Klook lists it at $29.25 and GetYourGuide from $28–35. The ₱150 city environmental fee is not charged twice if you already paid it at Honda Bay or the Underground River.
Will I see bioluminescent plankton?
Sometimes. It is seasonal and condition-dependent, which is why GetYourGuide sells a separate seasonal plankton product rather than promising it on every listing. Your odds are best on a dark, calm, new-moon night. A June 2025 reviewer watched boatmen beat the hull with oars to force it — you can ask them not to.
Can you take photos of the fireflies?
Realistically no. Flash is banned because it disorientates the colonies and destroys everyone's night vision, and phone night modes cannot handle 30 to 45 minutes of near-total darkness on moving water. Treat it as an evening you watch rather than record.
Do the fireflies pair with anything else?
Yes. It starts at 17:30, after every day tour has finished, so it slots onto a Honda Bay or city tour day at no cost in time. GetYourGuide also sells an Underground River plus firefly combination at $84, 4.5★ from 129 reviews — one 14-hour day and two headline attractions.
Is there a cheaper firefly tour than Iwahig?
Yes, at the Kitu-Kito or Nagsaguipi River site, sold mainly on Klook. Same concept, usually a shorter transfer and a lower price. The Iwahig product has the deeper review record — 891 TripAdvisor reviews at 4.1/5 — so the cheaper option is a value play rather than an upgrade.
Are the fireflies a big swarm?
No, and this is the expectation that most needs setting. Colonies light individual mangrove trees along about 1.2 km of river; you drift up to them one at a time. It is not a synchronised swarm, and an August 2023 reviewer who saw perhaps ten insects on a bad night is a real risk you take by ignoring the moon.