The island where you land is Fort Ridley and includes Main Street, the farm, and the governor's house.
The 5 trading islands are:
Dragon Cove - upper left
Bouffant Bay - upper right
Parrot Port - middle right
Golden Harbor - lower right
Pirate Outpost - lower left
*The hidden island that is revealed by the map pieces is just right of the Pirate Outpost.
you have to get doubloons by trading grain silk medicine and spice (go around all of the islands on skullduggery)
go to all of the islands and talk to everybody there
you need to buy all of the stuff where its cheapest and sell i at the dearest islands then you will get money and be able to buy the biggest boat - eventually!
I think you go on Skullduggery and there is a secret island that appears on the map after all five pieces are assembled.
To trade and sell on island on skullduggery island you first must be on one of the 5 islands and walk around you should see a post that says " TRADING POST"
go around the islands and trade stuff with then
The 6th outlying island is hidden until you collect all 5 map pieces (one from each of the trading islands). It only comes into play after you have driven off Captain Crawfish and have the Treasure Location card from the Governor. Travel to Skullduggery and use the bone shovel to dig at the marked location.
Collect the five map pieces (one on each of the trading islands) and join them to see the sixth island, Skullduggery. Once it appears on the map, you can actually go there, but nothing happens there until the end of the game. (see the related question)
When you have all five map pieces from the 5 trading islands, select them from the item list and they will combine, and the new small island (Skullduggery) will appear near the Pirate Outpost. You can't do anything there until you have beaten Captain Crawfish and returned to see the governor.
There is a dock at the bottom side of the small island, Skullduggery. The island appears when you have collected all 5 of the pieces of the Treasure Map.
When you have all of the map pieces from the 5 trading islands, the 6th island (Skullduggery) appears near the Pirate Outpost. You cannot do anything there until you have beaten Captain Crawfish. This will require the largest ship, the Phoenix Warbird, as well as hiring the Shipwright and Cannoneer. Once you have beaten Captain Crawfish, go to see the governor and he will give you the directions to the buried treasure on the hidden island.
OK look when you get to all islands you have to trade them