when you go into the museum on mythology island, go right and you will come to a hall that tells you all about the gods. when you reach posiden's statue, there will be a huge pink starfish sticking to his face. this is posiden's offering.
On the island
you will find pomegranetes by the creepy Sphinx thing and that is the offering.
The pomegranates are on a tree in the Garden of the Sphinx, which is over the bridge from the Tree of Immortality.
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To get Hades's offering, you go to the garden with the spinx statue. You then find a pomagranate tree and pick them. Those are the offerings.
The offering is pomegranates, from the tree above the creature in the Garden of the Sphinx.
To get to hades castle: Go all the way to the end of the island and there is his castle. There will be an offering table. Find pomegranates and put them on the table. A door will open. Take it from there.
In Greek myth, it is with Poseidon.
To open the door, when at the minator, jump up and find a pomegranite tree. Jump so that you hit the pomegranites and you offer them to Cerberus
Mythology island, on a statue in the museum
Find him and click on him.
You get the offering in the Greek Mythology Museum. He has a starfish on his face, so click it and go to his palace place.