I think, don't know for sure it is at playa Cayo, where is the sugar-company. Few years ago I spoke with tourism and they told me eco-tourism wanted to have a harbour and dock for repairing/storing boats. Because of the dirty canal behind and the wind/waves and dirt from the sea I didn't continue with this project.
Another possible project is remove all the reef at Quemaito to another beach to make a kind of port. The locals disagreed with this project but you never know.