I am planning a holiday in Switzerland staying with a friend in Bern. While she has asked me to come for a month I do not wish to out stay my welcome and am looking to plan several one or two day trips from Bern (or more days if that is recommended by anyone). I am interested in learning about Switzerland, it's nature, culture, industry. I like train travel very much.
I will continue researching on tripadvisor, but any advice will be greatly appreciated.