From the back cover :
Each player leads a group of pirates to Pirate's Nest on Tortuga. The path leads the pirates through wild jungle and across the waters of open ocean to the island of Tortuga. in addition to the innate perils of the trip are the other pirates, as each group wants to be the first to arrive at Pirate's Nest and will do what they can to slow the others' progress. As soon as one player has all his pirates in Pirate's Nest, he can raise the Jolly Roger and win the game.