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15 is probably okay for a quiet cruise around the Bay, but I think 15 is pushing it especially if you're going out in the ocean. Sounds like you might be departing from Mission Beach. Since you're only 30 minutes from the Bay by boat, Why not have half of your guest drive down and meet the boat in the Bay. Enjoy the day in the Bay as a group, then have those that came by car take the boat ride back, while the others take the car back home.
Good luck, Art