I'll be staying in St. Martin from Christmas Eve to around New Year's. I was thinking about doing a day trip to St. Barts, concentrating on St. Jean and Gustavia until I looked for a car rental. Seems that nothing is available for a day rental. Also tried plugging in more dates and came up empty until I plugged in some dates before Christmas Eve. I know there are cabs but I'm now a bit concerned that St. Barts is going to be mobbed during that time and cabs will be in short supply. I'm also wondering if the vibe will be annoying.