I found the UNM interview day very underwhelming compared to the other schools I've interviewed at. Granted, I interviewed two years ago and that was my only interview, while I've had 9 interview invites this year. As for my interview day when I had it, I waited on a couch, interviewed with one person (radiologist), waited on a couch, had a tour of the library and anatomy lab, lunch with a student, had another interview (internal medicine), and it was over. No presentations of the school, curriculum, etc. they just told the two of us to look at the folders they gave us. At most of the schools I've interviewed at this year, it's been breakfast with interviewees and students; amazing presentations of the school, financial aid, state issues, etc by faculty and staff; great lunch experiences eating with current students and faculty (lots of people!); lengthy tours of hospital(s) and facilities (I loved this), etc. I enjoyed my interview experiences at Johns Hopkins, Cleveland Clinic, UW-Madison and Georgetown the most- they actually try to sell their schools. I would say Harvard's interview day was similar to my UNM interview day.
I hope UNM has changed the interview day since I interviewed, and it seems that they might have given some of the above responses. YMMV. Either way, just try to enjoy yourself. 🙂