The funniest cycling travelogue I've ever read is Tim Moore's 'French Revolutions'. In that book Tim, a non cyclist, decides to follow the route of the 2000 Tour de France. In his new book (out in May) 'Gironimo!: Riding the Very Terrible 1914 Tour of Italy' he sets off on a period bike, largely made of wood, in period clothing, and rides the route of the 1914 Giro. If it's anywhere near as funny as French Revolutions it'll be a terrific read.