The answer is: it depends. It depends on how the PDF is made -- if there is a lot of text, you can have the reader (700 or 505) reflow the text, but it will make it out of place compared to accompanying graphics. If you have a PDF editor and the travel books are created in a manner to allow editing, you would be well-advised (in my opinion) to change the travel books into single-column books and if you format the final version to fit the screen size of the 700, it should be easy to read the travel books on the 700.
I would add this caution, though, based on my experience -- there's nothing like being able to flip back and forth really quickly through the pages of a paper book, and even though I love my Sony Readers (I have the 500 and the 700) and do almost all my pleasure reading on them, there are certain books which I don't enjoy reading on them because of the need to quickly go from one page to another back and forth in the book. And travel books are one such book. I can find what I want by knowing where the page is relative to the front or back of the book, and then I can find it by thumbing through the pages at the approximate location. Of course, the bookmarking and annotating capabilities of the 700 make such things possible, usually when looking in a travel book, I'm in a hurry to find the exact information I need and don't want to bother looking at a list of bookmarks or annotations to try to remember where the information is that I want.
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