With all due respect my love
Not even if you grow tits on your back, fellah. I'm hopelessly straight, no matter what today's fashions dictate.

Not too many Great Whites around Puerto Rico these days, so that scenario isn't very plausible (and gawd, I'm so glad that scenery-chewing shit of the 70s is mostly gone from the screen...) And no, sharks don't normally attack boats... who the hell came up with that stupid plot, anyway?
The whale would probably have shaken it loose somewhere in the Mona once he stopped panicking, and I suspect the Coasties would have spotted it out there pretty quick - they're always on the lookout for illegals crossing from the Dominican Republic. Maybe that's a little too prosaic for you, but life is like that... although there are plenty of things at sea that no landlubber would ever believe.

