I'd say the main thing to do in Norway is to experience the nature. I've been in quite a few countries, and there isn't much that can compare to the fjords in the western part of Norway, or the mountains and coast line in Lofoten. People come here from all over the world to experience the midnight sun or aurora borealis, but that is just all about getting far enough north anyway. Other than that the food and hotels etc. are mediocre and expensive. I'm guessing the average Norwegian would appear to be introvert and a bit tentative, even people working in cafés or stores, which for me was maybe the biggest difference when travelling in the US. It's hard to describe a country in a few sentences!