What is the author's tone in In a Sunburned Country by Bill Bryson?

The tone of the book is split between reference for Australia's many wonders, and Bryson's relentless sarcasm. He writes in a confident, conversational style, as if he is relating the story to a friend, and his enthusiasm for the subject is evident in every story he tells, and in every description he writes about the ordinary and extraordinary sites of the country. He seeks throughout to impress upon his readers that they need to get themselves to this delightful continent at some point in their lives.