The tour is on a very crowded boat. You stop at two places in the marine park. The park is beautiful itself, but so much of the tour involves being on the boat that you get sick of it. Granted, it takes two hour to get to the park from Koh Samui.
So much of the tour is organized to get kayakers going and picking up. We signed up for snorkling, but that's what everyone could do and the snorkling itself was not good.
Separately, if you have been to Ha Long Bay, it can be underwhelming, but it's still beautiful.
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