I believe there are several vendors offering the firefly watching excursion. Our hotel arranged the one my partner and I experienced for 1200 pesos per person (including a "seafood buffet") in January 2014.
When we were considering excursions to purchase, we were enticed by representations that the red light cupped in the hand of our guide would "attract" the fireflies. Alas, such was not the case. This excursion is best described as a boat ride to view a smattering of dimly lit Christmas trees. The fireflies do not envelope the boat passengers, as I had imagined. Plus, the boat does not stop to allow passengers to take a proper low-light photograph.
The "seafood buffet" served on the boat was also disappointing. The meal was very simple and portions were small and served family-style. This wouldn't have been a big deal, except it was advertised as a "seafood buffet": my expectations were not met.
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