When you get off a boat, you should say thank you to the people who brought you onboard. If it's your boat, and people are there with you, maybe you can say thank you for them coming with you. Just a suggestion.
Usually people love to travel via boat including me :). At some point you need to get off from boat.
Question is asking about what should we say when we get off from boat. There can be lots of answers for this question because there is no fixed rule to leave the boat.
You may say good bye or wish the people who are still on the boat.
In fact you are free to say anything in the world. :)
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