The Adventurers Guild has elected you to rescue a captured adventurer. Recently the guild received a note in a bottle asking for assistance. The author explained that he had been taken captive on Treasure Island by pirates. Unfortunately, the exact location and name of the unlucky adventurer were destroyed by sea water. However, in the bottle was a map.
A word of caution: legends tell of hidden caverns with one-way passages and tunnels under the surface of the island. Also the water around is infested with man-eating sharks.
A ship will drop you off on the ship but it has other duties. Another is scheduled to land on the south beach soon after you are dropped off.