How do you get the 5 sacred items at mythology island?

To get the sacred flower, go to the garden of sphinx and talk to her. She will tell you to give the flower water. Here you gradually make your way upwards and turn or push dials. You need to make the circuit flow, and once you have, retrieve the flower.

To get the golden ring of the Minotaur, go through the maze to the bones. Make the bones form the Word TEN. After this, the gates will open and you have to go inside. When inside, there is a portrait with holes in it. Snakes keep popping out of the holes, but the snake with the red eye is the one you MUST keep poking. The fastest way to do this is to stay at one hole and wait for the red-eyed snake to come out, as it is to quick to go right to the hole it is waiting at. After you've poked for a while, the game will end and you can leave the maze, where the Minotaur will hand over his nose-ring.

To get the Hydra scale, you must go to Posiedon and offer a starfish which you will find in the temples. Once inside, swim across the ocean. There will be a dark patch of water where you must dive into. Then, go through the maze and into the cave with the "gnarly monster" lies. When each head attempts to strike you, jump on it. This will cause the head to fall. Once all heads have fallen, walk towards the monster and take a scale.

In the maze there willl be one pearl which you must retrieve as it is another sacred item, the pearl of Poseidon. It is contained within a calm which will open and shut, so take it before the clam closes or you will be knocked away. (Of course this is a minor issue, as Poptropicans are immortal, which is quite nice, it just uses a cutscene to show yourself falling slowly until you hit the bottom.)

The fifth sacred item, a whisker from Cerberus, is the most difficult to get. Cross the River Styx (stand close to Charon, duck when the stalactite falls, jump immediately afterwards to avoid the floating skull, and jump again as soon as you see the alligator/crocodile head. Repeat [I believe] 5 times and you will see Cerberus. Play the song that you received from the Muse (called "Pipe Tune") and Cerberus will fall asleep.

*SPOILER ALERT*

Zeus cannot be trusted...