Switzerland...Studying in a foreign country.

I am in the process of saving up to spend a semester in Switzerland during my senior year of college. Right now I am only an up and coming sophomore but I am trying to make plans for it now. I was wondering if anyone out there who has studied abroad has any tips for me. I’m kind of wondering if there are any hidden secrets of things I should know before I go. Things like places to see, stuff I need to bring, errands I need to do before I go, and any other useful info. that people want to share. Also I wonder if there is any hidden expenses I should be aware of (that’s kind of a big one to look out for I would imagine) I appreciate any advice anyone wants to share with me.