I am an experienced traveler and very interested in this topic. Not Crichton's best. He is an engaging writer and the first half of the book held promise, as it held true to the title. The second half focused less on his travel destinations a experience and more on his increasing interest in and then affirming beliefs in out-there spiritual phenomena and experiences with mystics, channelers, etc. Perhaps interesting if you are interested in these topics, but not true to the theme of the book.
This was an interesting departure from the usual Michael Crichton books in that it was autobiographical. He seemed to only learn about himself while traveling. I enjoyed his frankness, his willingness to expose his foibles. The most interesting chapters were about his days during medical school. The pattern of the travel chapters was exposing another of his flaws in a different country. I became weary of this navel gazing aspect toward the end of the book. But overall, I would rate it as an interesting read. He was a brilliant author who died too young, in my opinion.