In order to swim with the whale sharks you first have to register at the Visitors Center (located at Donsol's beach). They will give you some information about the preservation of this unique species, along with a video describing the snorkeling tours.
Tours start at the beach first thing in the morning. Each boat has capacity for six or eight passengers. If you are on your own, the tourist center will put you on a boat with more people. Next to the tourist office you will find some shops where you can rent your mask and fins.
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