Francine,
They are going to put a full-torso life vest on you before they let you sit on that jet ski, so once you get on there, there will be very little body showing! I am short and they gave me the smallest one they had, all the others in the party passed it around and laughed saying it was for a child, but it fit me perfectly without adjustments. That said it came all the way down to my hips. Only legs and arms left to be seen. I am a real chicken and we did the circle Bora Bora jet skis this spring. My husband sprained his ankle slipping on a wet deck (on Voyager) and couldn't drive (he didn't even want to go!) so I wound up driving. It was great. The water was a little rough and I had some sore arms and shoulders the next day from muscling that jet ski, but it was a really great experience. On our excursion, the guide took us over to the pier for Bloody Mary's and took each couple camera and photographed them on their jet ski in front of the sign. You will have a great time and a great souvenir.
Debbie