Actually, my comments are tongue in cheek but if you REALLY want to be accepted on someone's personnel, private time on their vessel you might want to consider the following:

1. Appear to be grateful and helpful
2. Offer to share in all expenses.
3. Make very clear who you are, where you come from, any experience and how gracious you are to be considered.

Basically, it's an interview and you're the applicant. I don't hire within my company unless i know as much about you as possible. I certainly wouldn't allow someone on my boat for a vacation without knowing EVERYTHING about the person(s) and how these extra people would fit with the rest of my crew.