Even if you haven't gotten an assignment to write a travel article, you can come up with saleable articles while you travel (unless you choose to escape work when you travel.) Writer Larry M. Lynch has some tips on how you can garner a dozen articles from a week on the road. Of course, it sounds like by doing so you forfeit free time, but then you can take the sales from the articles to buy another vacation, one in a boring locale from which no stories can be generated.