A travel itinerary is symbolic for so much of life. The travel itinerary you're carrying around in your head is a lot like the map you probably used to carry in your glove compartment. It's got the big picture, but it doesn't tell you everything. It's a guide, but the route can be altered as you go along. If it were too detailed, it wouldn't be nearly as useful, and you'd spend all your time checking off places and directions instead of making discoveries along the way.