Have you ever won a FREE cruise to the Bahamas?  Yes, me, too!  It cost me over $300!  This mistake is a common one, according to travel expert and consumer advocate Christopher Elliot.    He writes about this and the other most oft  travel mistakes and how to avoid them in his article, Know Your Erroneous Zones, published in the August/September issue of National Geographic Traveler.  What is the biggest travel mistake that you’ve made?