Honestly they should just stop all cruises. Think about the numbers here. From the same Reuters story I quoted from above:
The cruise ship Grand Princess, barred from returning to San Francisco last week due to a coronavirus outbreak on board, will send its 2,400 passengers to at least four quarantine centers. The crew of 1,100 will be quarantined and treated on board the ship.
I can only assume that the taxpayers will be funding the quarantine for those 3,600 people. And not only that, imagine how many federal (and state and local) emergency response assets will be used up in that process. And then factor in the number of federal/state/local health care responders who will then need to be quarantined. All at a time when those assets are needed in dozens if not hundreds of other locations in the US. To go on a cruise now, or the continue operating the cruise ships, is the epitome of selfishness at this point.