Here's an abstract, Dalamar can try to put it into a map if he has the resources.
The island is of roughly a 5,000' radius.
On the north shore, there is an elaborate dock, adequate for a full sized pirate ship to moor at. The dock has two enclosed rooms with roofs on them, each of which rounds off to 10' x 10'. Connected to the dock structure is a depot with the supplies you've been asked to destroy. You can't tell if the depot is manned, but it's a 50' x 80' structure.
Towards the center of the island is a fort, 150' x 150' there are several buildings inside.
For whatever reason (bedbugs?) a number of the pirates have elected not to sleep in the fort, and instead have a variety of scattered campfires about the island. There are about a dozen of these in random locations, with about 3 to 5 men at each fire.
The party is on the south by southeastern shore of the island. Jack is about halfway from there to the depot, moving stealthfully.