There has to be a reason for this... a goal... Like a famous buried trasure, buried by blackbeard himself. The island that where 'twas buried, was submerged into the sea and lost to all save for blackbeard himself. He still has the map and ye must find where he hid it, before yer rival beats ya to it. All the while, the wretched East India Trading Company dogs yer every move along with an ungrateful British Empire....
or something like that
It could be like a mystery, the captain going around to different ports to talk to people for more information, whilst the crew get more and more frutrated with this wild goose chase, and just wanna drink and be merry.
yeah i'm looking forward to this