As a sentence, it's fine. The grammar is OK and nothing needs fixing. I'm not sure about the meaning, though. Who is saying this to whom? I wonder if you've perhaps chosen the wrong words, because the scenario seems odd. Why are you on my boat and why are you telling me to come on it and find my treasure? Can you explain what you are trying to say?

umm. It has only a small mistake which is "on" you should put "in"