Providenciales is generally easy to navigate. The most difficult points of interest to locate are some of the more remote beaches and a few of the natural attractions. There isn't any tourism signage, and little general directional signage.
There are free road maps available at
Providenciales International Airport (PLS), so we highly recommend you pick when up. They're avaiable in the baggage claim area. Also, it's common to receive a map when you rent a car.