You don't have to rescue Balloon Boy. His part of the quest is literally "left up in the air" because he is still floating over the city when you have the scooter chase.
you go back on counterfeit island
You go next to the museum and go to the balloon and leave.
you go to shark tooth island then you try to dodge the shark attacks
The art museum on counterfeit island opens after you go to the guy at the dock.
Once you get the key from the curator, go back to Counterfeit island and use it at the Inspector's house.
You don't need to sleep in counterfeit island :).
Go on www.youtube.com, search in counterfeit island walkthrough. It might help.
the picture on counterfeit island is a picture for when you go underground and you go on top of the ladder u fix the dragon the way it is on the picture
If your talking about Counterfeit Island then you get the key and go back to the museum on Counterfeit Island
First go to skullduggery island,take your ship to a island called Keys World island and you will find the key of the chest on counterfeit island!;)
In the supply room
you go out the door!