Thinking of cruising to the islands of Saint Thomas or Saint Martin in the Caribbean? Dubrovnik in the Adriatic? Santorini or Mykonos in Greece? All these destinations suffer from one thing in common: On many days, there are too many cruise ships in their harbors. CBS News travel editor Peter Greenberg explains what you should know before you book an itinerary. 

(Photo credit: Getty Images)

<p>Thinking of cruising to the islands of Saint Thomas or Saint Martin in the Caribbean? Dubrovnik in the Adriatic? Santorini or Mykonos in Greece? All these destinations suffer from one thing in common: On many days, there are too many cruise ships in their harbors. CBS News travel editor Peter Greenberg explains what you should know before you book an itinerary. </p>
<p>(Photo credit: Getty Images)</p>

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