How do you get on a ship?

Answer 1

Early Poptropica - the ship arrives when you have returned all three items, and raised the signal flag. Go aboard at the dock to receive your Island Medallion.

Astro Knights - the spaceship is the saucer Excalibur, in the mud swamp to the right of the mill. Get the hovercraft from the attic of the mill to reach it.

Skullduggery island - Once you have read the document at the Governor's house, get the broken mirror from the General Store and use it to signal at the telescope.

Ghost Story Island - Once you have the ghost-hunting equipment, go to the cemetery to get a photo of the Cemetery Specter, and sell it to the paper. After you deposit your $50 at the bank, a ship will arive on the beach near the Inn.