After months of waiting, the Poptropica App is here as a free download for Android! Get it on your phone (or if you have one, tablet). It's almost the exact same as the iPad version, and they don't force a particular aspect ratio, which is awesome -- Poptropica in HD! If you need help on any of the islands, check out the Walkthroughs page, which has written guides for every island, and video guides for most too.
And speaking of bigger screen sizes...
Stay on the lookout for a video walkthrough and review from Poptrickia sometime soon! In the meanwhile, check out the excellent written guide. Happy shrunken adventures!