You go into any harbor.
You repair your ship by pulling into any harbor. You can upgrade your ship at the ship builder's at Dragon Cove.
Just dock in an island and your ship (or raft) will fully heal.
The cannons on your ship!
No. To sail a ship, go to Skullduggery Island.
You can trade your ship in when you buy a larger one.
you have to get doubloons by trading grain silk medicine and spice (go around all of the islands on skullduggery)
you dive to were your ship(raft)is and you swim till you get to sand
Once you've gotten to the Japanese island you go to the guy selling ships and if you have enough money you can buy a bigger ship.
When you have enough doubloons, from salvage or trade, you can buy a larger ship at the Shipbuilder on Dragon Cove.
The only ship you go on is your own. You begin with the raft and you buy larger ships as you can afford them.
When your ship is damaged by rocks, creatures, or cannon fire, it will "catch fire", and your health meter will be lowered. Unless you have the "shipwright" (a skilled crewmember from Dragon Cove) you will have to dock at an island to repair your ship. (*the decorative fires at Dragon Cove and the Pirate Outpost do not go out)
The blimp is at Fort Ridley, the middle island, next to your ship/the sea. Hope this helps!