If you love humor in travel books, you might want to have a look at CNN's list of "The 15 Funniest Travel Books Ever Written (in English)." (Just click on the photo for the link.) There are some excellent titles here, perhaps including some that you haven't read.
Of course, I don't entirely agree with their selection--wasn't Bill Bryson's In a Sunburned Country funnier than his Walk in the Woods? And how could a list like this omit Eric Newby? But as Barnaby Rogerson, chair of the Donlan Travel Book Prize and publisher at Eland, says, "each and every passionate reader will have their own list."
I hope you enjoy some of these books, and I'd love to hear your own choices.