Yes, there are several people in the Skullduggery Island on Poptropica. On of which is a deck hand. you can find him on the top left island.
There is nothing to be found on the hidden island (Skullduggery) until after you beat Captain Crawfish. After you defeat Captain Crawfish, the governor gives you a treasure location and a bone shovel. Sail to the hidden island. You will find the treasure under a mound, six paces right from the pirate flag.
The doubloon found under the bridge is used to buy the chicken feed in the general store.
go to the farm then turn around and go under the bridge then turn left. there will be a dubloon in the corner
Cross the bridge, then go down to the water. You can cross the river to the left, and you will find a doubloon there.
Cross the bridge, then go down to the water. You can cross the river to the left, and you will find a doubloon there.
Your Life gauge shows whenever a pirate ship or a sea creature is nearby.
Just right of main street at Fort Ridley. Go left under the far side to find a doubloon.
Get the chicken feed by finding the doubloon under the bridge to the right of Main Street (cross over and then go left under the bridge to get it).
You have to cross OVER the rocks at the Governor's house, but you can duck under the ones on the right side of the bridge if you go farther right before heading left.
There is a DOUBLOON under the bridge to the right of Main Street. The girl says she made a wish. Go down the right side and then left, under the bridge.
The stream is under the covered bridge to the right of "main street" at Fort Ridley. You can reach it by going down along the right side.
Cross the covered bridge and talk to the girl there. Go right, then down and left to the water, and cross the stream to the left.