You should deffinately just be yourself, I think it is a more laid back type interview, however you must still be professional. Go over your application and your essays, they might ask questions from it, about your experience in the medical field. Also the tpyical interview question, why you want to be a doctor, how can you be an asset to the medical field. How are you going to adapt to the island conditions and can you take the stress and workload. How have you shown in the past that you have handled heavy work load and worked your way through it. These are just some of what they may ask. This is based on my interview I had a while back and some of my friends that went through it too. The staff that you might get interviewed by are very polite, informative and very well educated induviduals. It might be Dr. E or Dr. S or maybe another faculty member from the admissions board. Most of all just show them that you are determined and dedicated to go through with this regardless of all the hardships that you will encounter and askthem questions also to show your genuinely interested.
Thats all i can really think of right now.
Good luck