Explanation:

- A directory is a listing of information or names, typically organized alphabetically or thematically.

- An itinerary is a detailed plan or schedule of a journey, especially listing places to visit along with travel times and activities.

- A trajectory describes the path or track of an object, typically used in physics or mathematics to denote a moving object's course.

- An inventory is a detailed list of items, often associated with stock or assets available in a store or warehouse.

In this context, the most appropriate term for "a detailed plan for a journey especially a list of places to visit" is:

- Itinerary