Bioluminescent plankton in Krabi, Thailand, offers a magical natural phenomenon that lights up the water at night. When disturbed, the tiny plankton emit a soft blue glow, creating a stunning, otherworldly effect. This phenomenon can be experienced through nighttime boat tours or kayaking trips in areas like Ao Nang or nearby islands such as Koh Hong. The best time to witness this natural wonder is during the warm months, typically between November and April, when the water is clear and conditions are ideal.