As an aside, but truly helpful, even better than Google Maps. If you have an iPhone or other iDevice, and android device or even a Windows tablet or phone, there is a downloadable app called maps.me, which has downloadable maps of the entire world including St. Martin. There is a "routeable" version of the St Martin map as well.

The beauty of this is that you can use it without being connected. No need for data plans or Wi-Fi while using it. Plenty of SXM landmarks are already included and you can add your own. And it will create and track routes for you if your device has a GPS.

My one suggestion is to download this app and the maps before you get the the island with its spotty internet.