We are traveling to Switzerland in July this year and will be there all day Sunday-Tuesday. We are taking the train from Paris to Basel (or possibly Zuerich). We are a family of 4 and have a 16 year old and a 14 year old. We are planning on using the train to travel between Basel and Zuerich and Interlaken. With a day trip to Koblenz. We also plan to use the trams and busses to get around as well. We lived in Switzerland for a few years but that was before kids and I am sure things have changed since then. What pass should we look at purchasing? Danke!