Definitely worth it to see; the glowing microorganisms were pretty cool. We could see them when we rowed our paddles, splashed water, on our hands and arms with the water dripping down, even when fish jumped! It was harder to see in the biobay because the moon was out half full and bright. Definitely want to check the moon before you go. Maybe go for the later tour if it's darker.
We rented kayaks with "Kayak Rental" for $45 pp. The concierge at our hotel set us up ahead of time. We were a bit disappointed by the "naturalist guide"; not exactly biologist material; more a local with a general ten minute explanation. The kayaking through the mangrove canal was awesome. People didn't realize on the way in that the water was already glowing in the dark canal, they were all so focused on paddling! There were other kayak groups ahead of us and behind us, and motorized boats also traveling through the small canals. Lots of yelling, "stay right!" Through the canals the guides only focused on getting us all in through safely. After we were in the bay, we had a little guided explanation but it was brighter because of the moon so not as fantastic. The current was going out, so on the way out, everyone was bumping into each other; it was a bit comical or stressful depending on who you were.
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