I live on St. Martin/St. Maarten (sorry im dutch
) , January is highseason which means that there are alot of people from all over the world. It's a great time to visit St. Martin. Especially the nice regattas!
There are alot of single people too, especially in the Simpson Bay area because that's the place where all the "boaties" hang out. And where you met alot of new friends. It's my favorite place to be. You'll have a nice time.
Oh, and try the "local" food too. Places like Pineapple Pete's and Lady C are not the most cheapest. You'll find out yourselve! Have fun.