Go to the Temple of Hades and place the pomegranate on the 'offering shrine'. Then you'll find yourself next to the River Styx where you can proceed on your way to Cerebus to get Cerebus' whisker.
The starfish on mythology island is on the face of the statue of Poseidon in the place right next to the balloon when you get on the island.
Poptropica is a game that can be played on line with various levels and objectives. The costumes that you have to put on require a surfer's belt that you can get on mythology island next to Aphrodite on the surfer.
If you are asking what island is next on Poptropica, I believe it is Reality TV Island.
There are many islands of poptropica
U have to find where its flowing from and just pull the lever then find the next then the next until the water is flowing on the Monster Thingy
The next island migh be a tropical island in the sneak peaks.
On the Poptropica blog, I think they say the next island is Pop Island ***ALOS ANSWER!!*** There is no pop island as you can plainly see so
Mythology island
wimpy wonderland island
The newest island on Poptropica is Red Dragon which is opening soon. (I have no idea when, sorry!)
After the Astro Knights island release in June 2009, the next regular feature was Poptropica's Haunted House in October 2009. (Available through the Poptropica Store) The next scheduled island was Counterfeit Island.
Mystery train island