From Viator:

The activity starts with a safety briefing and then the kayaking starts. Each kayak is equipped with lighting to light up the ocean all around. The tour starts after the sun sets you are able to see above and below the water.

Your local guide will take you and a small group of fellow kayakers out to sea, where you'll get to experience both the sunset and the magic of the waters below you after dark, illuminated by the light of your kayaks before you return to shore for a round of drinks.