 I'm Peter Greenberg, and this is today's ION Travel Minute. Thinking of cruising to the islands of St. Thomas, or St. Martin in the Caribbean, or to Dubrovnik in the Adriatic, or Santorini or Mykonos in Greece, or let's not forget the inside passage to Alaska. All of these destinations suffer from one thing in common. On many days, there are too many cruise ships in their harbors.