If you are looking for the quest with this name, please see The Castaways' Island (quest).
- Through The New World quest. You must bring all the right ingredients to Captain Haddock'n'roll. Then you are taken to sea. You may access the island again even if you have reached Otomai Island you just need to talk to Captain Haddock'n'roll in Sufokia again.
- Losing all your energy points while on Otomai Island (Not sure the exact places however it is possible).