Mine was so basic. There weren't any trick questions at all. It was basically a conversation about what I do in school and out of school. The anticipated question of "Why Dartmouth?" also came up for me.
It was really straightforward and no tricks at all. You should be fine!
I had the chillest, most laid back interview possible. We met at a coffee shop and the guy was wearing jeans and a dartmouth baseball hat. He didn't really ask me questions; we just chatted like old friends for about an hour. I knew his nephew and we go to the same church, so that gave us some good talking points.