family of 5 2 adults and 3 teens summer 2018 Germany France

Our family of 5 - two 55 year olds, 12, 12, 14 year teens (turning 13 13 when we are there) are flying into Frankfurt and out of Paris for 16 days. We want flexibility to travel Germany, maybe Czech, Italy (northern lake, Venice or Rome areas) and to and out of Paris. What pass do you recommend?
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