Did as part of a day-long tour. Light breakfast, filling (if somewhat plain) lunch, and snacks provided. Viewpoints are worth the hike. Snorkeling is nothing special, but Koh Samui is not known for this. Chose not to kayak and believe this was the smart choice. 100 people, most of whom have never kayaked, all attempting to move together along a set route?! Had a perfectly lovely time hanging out at the green lagoon, beach, and swimming instead.
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