My husband and I will be in Milan in August - just as a home base. We would love to visit a couple of towns in Switzerland. Is any one able to provide options that are easily accessible via train for the day only? We'd like to limit our commute to 3 hours or less each way. We enjoy walking, scenery, museums, and old architecture/ruins. We're not into shopping, but do occasionally like to stroll through very old, quaint towns. Your recommendations are appreciated!