I went on a cruise this last summer. Besides my frozen insulin, everything worked out great. We usually had dinner in the served area rather than the buffet, and there were often great low carb choices and our waiter was quite pleased to accomodate special requests.
I also found that on the cruise, it was hot and I was more active, increasing my insulin sensitivity and I was often better able to handle carbs. What better way to handle an after dinner low than a piece of cheesecake?