The hovercraft (hover board) is in the attic of the mill (Ye old Rumour Mille). You can't get to it from inside.
Inside the Mill, you have to pull down the rope to unjam the gears. Then you have to go outside the mill and jump on the windmill arms to turn them counterclockwise. That will open the dome on top of the mill. Jump inside and the hovercraft will be there. You power it with the manure.
Then, go outside to the swampy area and you will see the hovercraft. Control it by moving your mouse left and right.
Once you add the manure to the hovercraft, it automatically goes to the point where it is used : in the mud swamp to the right of the mill.
You do not get or use a bucket on Astro Knights Island.
There is no treasure chest on Astro Knights Island.
There are no bird eggs in astro knights island.
go all the way to the right you will see a mill place spin the mill wings to the right as you will see it will start to open up go in there and there it is.
its on the island
How do you talk to the girl in the hay loft at astro knights island?
You can cross the mud swamp on Astro Knights Island by using the Hover Boots. These boots will allow you to move across the mud without sinking. You can find the Hover Boots in the Factory area of the island.
Use the hovercraft (hoverboard) that is in the attic of the mill. (see related question)
On every island you have to be the one to save whatever needs saving. That includes the kingdom in Astro Knights Island.
The hovercraft (hoverboard) is in the attic of the mill. Climb into the loft to release the gear lock, then go outside and climb on the windmill arms so that they turn counterclockwise. This will open the roof dome. The hoverboard is powered by manure, and will take you out into the mud swamp.
Once you have built a new spaceship on Astro Knights Island, it will park on top of the castle whenever you leave the island.