Every anthropology class starts with an explanation of anthropology and the fact that there are four main sub-fields in anthropology (i.e. Archaeology, Cultural, Linguistics, Physical.) Each anthropologist specializes in one of these fields. At the beginning of the semester each field is discussed, explained, and students are encouraged to think of examples of each. After understanding the fields, they are asked which of the fields they think they would like best. We do an activity where we move around the room based on answers to questions--where you end up is perhaps your best anthropological bet.
At the end of the semester, one of the last assignments, is for the students to re-visit the four subfields. After spending the semester learning about each of the four they are asked to think again about which one they like best, which one they think they would be best at & if they are now going to change their career path and become anthropologists! (After finding out archaeology isn't like Indiana Jones, most of them are out, although we do get a few converts.)