How do I free the crew?

Hint 1 of 3:

You must do as Daddoo says.

Hint 2 of 3:

You need to make a drink with a coconut, and rum, and there should be a
small umbrella sticking out of it.

Hint 3 of 3:

You can find the coconut on Monkey Island.
The umbrella is on Mulligan's Island.
Get the rum from the school on Treasure Island.