I went to the waiting area 5 minutes early because I'm not good at English. However, the car was 15 minutes late. I was so worried, wondering if I had made a mistake or if the car was even coming, when the songthaew truck finally arrived. After traveling by truck, I paid the 200 baht national park entrance fee and received a sticker and goggles. Then we moved to the harbor, and I got to ride a longtail boat, which I had always wanted to try. There were only two Koreans, and the other 18 people were multinational foreigners. It was complicated and confusing to speak at length in English, so I just laughed along when everyone else did, and that's how I did the tour. Snorkeling was great, with lots of fish and plenty of time. Watching the sunset and having dinner at Railay Beach was also wonderful. The bioluminescent swimming was short, about 10 minutes, but seeing only the sparkling firefly-like lights in the completely black sea and sky was so amazing and new; I will never forget today's experience. Of course, our boat captain was also very grateful and excellent. I highly recommend Mariam Tour.