Uh oh! A new Poptropica update has completely removed all the old islands from the map. There is no way to manipulate the game into redisplaying them, but you can use these links to load the old island you desire.
Charlie and the Chocolate Factory
All other islands are accessible through the travel map. If you want the old islands added back to the map, tell the developers! You can contact them by posting comments on the Creator's Blog and messaging the official Poptropica social media accounts.