Please rephrase your question with which island.
Example: "Where is the man on Counterfeit Island?"
He's the old man from the hut.
Route 208
all you have to do is find all of the ingredients and click on the medicine man.
On top of the Sphinx in Nabooti Island, Poptropica, you put the stone you find in the man's bag by the tent.
you ask the mimes and they sing, so you go to the jazz place and find him next to the stage
ask sombody else on wikianswers i dont know
create or find a potion to make the shark go to sleep
on a sign that a man is hammering at dusty dulch
u have to find the three items and give it to the coconut man
You have to find the tickets in the trash can and give it to the man and he'll give you one
You click on the man with the beaver hat (on the time traveling watch) and it is up the tree.
after you find 24601 on poptropica find a place where you have to crack the code