Pub

is a location in the game.

What to do here

 * Coin: You can pick up a coin from the floor (if you don't have any).
 * Rum: You can exchange one Fish Soup or one Grilled Fish with the Pub owner to get a bottle of Rum.
 * Beer: Pay one Coin for the Pub owner to get a beer. 3 beers and you will be drunk. Unlocks the "Drunkard" achievement.