Bonjour!
OK, Germany and France are a bit different but I might still help you a bit.
If you want to blend in wear dark colors and DO NOT SMILE. That an American tourists dead giveaway.
Hotels tend to be expensive, it might be a better deal to rent a suite with a kitchen (in France hotel Citadines for example) you will end up saving a lot even if you only eat reheated cans bought at the supermarket. Gas is about twice as expensive, many roads have tolls plan accordingly. The train might be a good options for some especially if combined with a rental can sporadically.
Don't get an international phone in the US unless international travel will be more habitual. Pay-phones are rare these days, but you can find decent multiband non smartphones with prepaid plans about everywhere, even supermarkets. If you have an Ipod/Ipad you can use for email at Mc Donald (at least in France Used to be the case in Germany). Talking about supermarkets, I haven't been in Germany for a while but I remember finding local wet shaving stuff in bigger supermarkets. If you have an international (multiband) smartphone you can get a prepaid chip here.
Whatever you do NEVER fly into Europe through Paris there are random strikes all the time and you might get stuck, they will also make a point to lose your luggage

, I personally prefer Frankfurt better than Amterdam, but both are OK, I found London to be a mess as far as airports are concerned. Bon voyage.

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