Want to have some fun? Carry a folding straight razor! Tell TSA
you plan to shave on the plane.
Seriously, I think I would try to look as much as possible like the picture on my passport. Unless, of course, it is a black-and-white picture.
I'll resist the boorish American comment that if you want to persuade them that you really are French you should stop showering. (Oops, I was going to resist that.)
Enjoy your visit. I apologize for the bread. Enjoy some local wine, especially if you go to California.
Happiness is not seeing another trite Ste. Maarten photo all week long.