The arches are the curved doorways at Golden Harbor. When you light the street lights there (4th, then 2nd, then 1st), the map piece appears at the top of the third arch.
I'm pretty sure you turn the lights on a certain way.... Theres more info on that when you type 'How do you beat skullduggery island?'..... I personally haven't been on in a while. Hope this helps!
You arrive at Fort Ridley, the Main Street island. Above are Dragon Cove and Bouffant Bay. To the right is Parrot Port. At the bottom left and right are Pirate Outpost and Golden Harbor. Once you have collected a map piece from each of the 5 islands, the 6th outlying island (Skullduggery) will appear near the Pirate Outpost.
At Golden Harbor, the map piece will appear in the curtained doorway between the 2nd and 3rd lamps. Light the 4th, 2nd, and 1st lamps in that order (considering the 5 lamps from left to right).
Golden HarborTo get the Treasure Map piece at Golden Harbor, you have to click on the street lamps (lanterns) so that the 1st, 2nd and 4th lanterns (counting from the left) remain on. The lanterns should be turned on from right to left : 4th, 2nd, 1st. The map piece will appear in the draped archway near the 3rd lantern.
There are five metal street lights or lamps along Golden Harbor, from the dock (1st) to the right side of the bank (5th). To recover the map piece, you have to turn on the 1st, 2nd and 4th lights. They should be turned on in the order 4-2-1 or 2-4-1. The map piece appears in the draped doorway.
You have to turn on all three lights : 1st, 2nd, and 4th. Turn the 1st one on after the others are on. If it is on when you turn on the 2nd one, it goes off. So turn them on 4, then 2, then 1. The map piece appears in the draped doorway.
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You have to turn on all three lamps: number 1, 2, and 4. But turning on number 2 turns off number 1. So turn them on in the order 4, 2, 1 or 2, 4, 1 and the map piece will appear in the doorway with the drape.
it has something to do with the lights
At Golden Harbor, there are five hanging street lamps. The draped arch shows that you must light the 1st, 2nd, and 4th from the left. You can do this by lighting them from right to left :4th, then 2nd, then 1st (2nd, 4th, 1st will also work)The map piece appears in the draped doorway.
Golden Harbor (an Arabic-themed island) is southeast of Fort Ridley (in the lower right position). Its bank will loan you doubloons to buy larger cargos but it charges interest. Only Grain is bought cheaply there.