Crazy idea: what if cargo ships towed behind them a &quot;cruise barge&quot; - basically a section of cruise ship that people can rent cabins on to go from point A to point B -- its basically like a cruise ship - but its only on the barge behind the cargo ship - maybe not as luxurious as a cruise ship - but might be another way to charge given that no matter what the cargo ships will always be traversing these routes on the seas.