I think that you may be thinking about Nabooti island, I think that is a turban or something like that though.
you use the hard hat for the mine all the way down on the bottom of nabooti island on poptropica
u get the workers hat on NABOOTI island by taking pictures for the safari man
On Nabooti island you have to wear one to go into the mines
Why do you need to know that? The hard hat isn't on poptropica besides nabooti island which you get the hard hat for the safir picture taking thing.
you click the shirt then click on someone then on their hair or whatever they have on their head
you trade the cactus figs for it on the actual nabooti, not giza, or nothin`
There are a few special items no longer available on Poptropica, including the Nabooti Mask and the sunglasses from Time Tangled Island. However, special costumes can be found in the ad mini-games, on islands (the Viking armor on Time Tangled Island), or by using the cell phone on Nabooti island (brain hat, police uniform, and a nerd look -- Caution! These are not reversible!). (see related question)
There isn't a jewel in the Safari on Nabooti Island. You need to take seven good photos of animals for Zeke in order to get the hard hat needed in the diamond mine.
When you have the cell phone on Nabooti Island, dial 1225 and you will get a removable ELF hat and a bag of toys. (see related question)
You get a hardhat from Big Zeke when you beat the Safari.
When you finish the mission, go to the mayor and he'll give you the medallion. He has a black hat.