PUERTO RICO: Bioluminescence is a natural phenomenon where “living organisms emit light”, oftentimes when disturbed. You have probably seen this on land–fireflies lighting up the night–but it can also occur in the water. Mosquito Bay in Vieques Puerto Rico is the brightest glowing bioluminescent bay in the world.
If you scribble on your hands with yellow florescent markers and put them under a blacklight, it produces a similar effect. Note: This made my hands itchy, so be sure to wash up immediately afterwards. There are also Bioluminescent Kayaking Tours available in some parts of the country to see it IRL.
Bioluminescence2, Bioluminescence3, The Glowing Bio Bay in Vieques (Puerto Rico), NY Post: Magical Bioluminescence (Australia; Puerto Rico), Six Places to Witness Bioluminescence (Puerto Rico), An Ocean Full of Stars (Puerto Rico), Bioluminescence- Moana (Puerto Rico)