Instructions
Wait until the point in the Jungle Boat Ride where you are introduced to the Sweeper. Fire paint or thinner at him to defeat him, and then fire thinner at the wall to his right. Jump through the opening, use a spin attack to free the trapped gremlin, and then use paint to activate all the columns and gears in the room. When these are all activated, a pillar will descend, allowing you access to a treasure chest; inside this chest is a Bronze Pin.
Proceed through the Jungle ride until you reach an area where several Sweepers attack you from high ledges. Fire paint thinner at the nearby yellow wall, and then pass through it and run to the left. Avoid the mechanisms that slide in and out of the wall and double-jump onto the cylindrical column beyond them. The column will rise, carrying you near to a platform above; jump onto the platform and run along it to find a chest containing a Silver Pin.
Embark on the Asia Boat Ride and proceed until you've de-activated the fans in the steam shaft. Pass through the doorway that opens when they're all de-activated, cross the playing-card bridge, and proceed down the shaft, avoiding or jumping over the holes in the floor. At the end of this shaft, you'll find a treasure chest containing a Bronze Pin.
Return from the Bronze Pin chest, through the shaft, to the island with the boats circling it. Ride the boat to the base of the high ledge covered with several gears, and then jump onto the ledge and activate the gears by spraying them with paint. When all the gears are active, a panel will open to reveal a small room; jump up to it and open the chest inside to retrieve a Gold Pin.