To be a tourist is to travel and stay in places apart from your usual place of residence, as an end in itself.
A tourist can usually be seen as clearly "out of place" with his current surroundings, therefore not to be confused with a traveller. The term tourist is tied to the activity of taking a tour or sightseeing.
Not limited to travelling, but used as a description of a person who enters a situation/culture, for a brief time, requiring knowledge that he/she does not have. admittance of such a situation, and a desire to stay and learn would promote the person to newbie.