Khanom is definitely associated with pink dolphins. The boat trip to discover them is the essential excursion of any stay here. It is advisable to go in the morning, the best time being between 7:30 am and 9 am. This is the time of day when the chances of seeing are optimal. Although obviously it is not guaranteed (for instance, I was unlucky when I was there and apart from a stealthy fin at the end of my boat ride, I did not see any dolphin). The area where you can see them is quite vast. It is around Laem Prathap Cape and goes to Donsak Pier. So when your ferry to Koh Samui
, Koh Phangan or Koh Tao, leaves have a look at the sea, you may see some pink dolphins. In Laem Prathap, there are many longtail boats to take you to see them. But as for me to take a more complete excursions proposed by the agencies (see with the reception of your hotel to reserve) is a better option. They cumulate the boat tour in the bay to see the loma si chompoo
(pink dolphins in Thai) and visit the small Koh Nui island, with Khao Wang Thong cave and a stop in a river for a natural fish spa. That way if you're unlucky and the dolphins do not show up, you'll still have a great day ! The dolphins are apparently there all the year long but you have more chances to see them when the sea is calm so the monsoon months (November-December) are less favorable. According to the authorities, there are 60 pink dolphins in the area.