A travel book is a book that puts you in the shoes of the traveler, and it's usually a book about having a very bad time, having a miserable time, even better. You don't want to read a book about someone having a great time in the South of France, eating and drinking and falling in love. What you want to read is a book about a guy going through the jungle, going through the arctic snow, having a terrible time trying to cross the Sahara, and solving problems as they go.
I grew up in an era of thinking of travel as escape. The idea that you could conceivably have a new life, go somewhere, fall in love, have little children under the palm trees.
Travel books are all sorts - some are autobiographies, some are about falling in love. Some are about having great meals, some are about suffering. There are as many different kinds of travel books as there are novels. People think a travel book is one thing. It's many things.
