The Seven Masks

You have been hired by a group called The Masquerade to find 7 masks. One of the members recently acquired a hitherto unheard of map of the Abath sea that shows seven islands, each with a drawing of a mask over them. This member claims that they bought it off of a woman during one of the group's famous Masked Balls, though all they can remember about her was her deep black mask with diamond stars and a line of gold cutting across it diagonally. She said that these were the rarest masks in the world, and that surely they would bring great wealth to anyone who posses them. Under the impression that you have to spend gold to make gold, they hired the best captain, crew, and ship that they could. And you folks, as the ground crew. Your job is to go to each of these seven island to retrieve the masks. Not only will you be paid handsomely, but any loot you find is yours.