There is no prize for beating all of Poptropica's islands.
No you don't get a prize I myself have completed every island and did not get a prize but I think if your a 1st 10 finisher I think you get a prize but I haven't been one so I don't know for sure well bye.
you beat all the villians
you beat all of the levals
You can finish all the islands, but you can not beat poptropica because they add a new island every two or three months.OF COURSE
you have to beat all games. get the jumbo prize trade it for the hellicopter.
For each island completed, you get the Island Medallion and 100 Poptropica Credits for the Poptropica Store. The Haunted House game awards 50 credits. There is no special prize for completing all the island quests. (see related question)
After you beat all the islands on poptropica, you can:Make a new character,Get your battle ranking up on your old one.Beat the mini quests,Follow poptropica blogs.Wait for the next island to come out (there were 9 in 2012)
after you defeat 1 island you get 100 credits. just think of how many credits you can get!
you have to beat all the games and give the jumbo prize to the kid with the helicopter and use the helicopter
There is a video walkthrough at the related link below. There are written WikiAnswers solutions at the related questions, as there are for all Poptropica islands. (How do you beat Steamworks Island) (What is the walkthrough for Steamworks Island)
I've already beaten all the islands, but nothing came up. It seems like there should be a prize for doing it though. -Nervous Comet
you win all the games on the boardwalk and get the jumbo prize then u trade the kid with the helicopter the jumbo prize and the you use the helicopter to snag the money