16 days travelling to Germany, Switzerland, Italy and France

Hi there! Could you help me by giving an explanation what transportation I should use for travelling to those 4 countries for 16 days?
I'll arrive in Frankfurt on August 11 2017 and planning to directly go to Switzerland for 3 days, then moving to Italy for 4 days, France for 2 days and the rest is in Germany. There will be 3 adults and 2 youths. Please help me to make a decision :(
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