Petite Martinique As Grenada raises its profile among travelers, its largely unknown sister islands are starting to be rediscovered. That includes the 586-acre-big Petite Martinique, a fishing and boat-building hub with just a few friendly guest houses to choose from. This is the Caribbean as it was long ago — and that’s a wonderful thing. Osprey offers ferries from Grenada to Carriacou, and then Carriacou to Petite Martinique.