That will be right in the middle of the high season. Allow for traffic to be heavier when you're planning your days, so have a little patience. Also, plan on making reservations for most of your dinners.
The island is small(35 square miles), but all main roads are single lane in each direction and some could use a little extra maintenance. Have Google maps on your phone and download the offline version of the map of the island, than you can use your phone as an active map while in the car.
Visit the website wearesxm.com and download their app onto your phone, it is an excellent resource. Also check out the visitstmaarten.com website for good content.
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