Had to laugh..Had same issue, BUT with husband and NOT on cruise..Trip to Hawaii.. Was SO much cheaper to purchase more luggage than to pay airlines for "Heavy" luggage.
Was actually thinking of bringing empty luggage with me, or barely filling 1 piece of luggage. Sonny thinking of Christmas shopping too. Not so much for "cruise/port shopping" but for Universal Studios shopping..New Harry Potter rides, etc. We have 6 nieces/nephews