During our long term trip we carried 2 debit and 3 credit cards from 3 different banks, just in case one or the other got goofy. Glad we did because each car had an "episode" somewhere. We normally used one card for ATM and another for fuel etc. We preferred to use ATM's in order to keep the number of folks viewing our card to a minimum. ATM's were our preferred method.
Be SURE that you notify each account holder by phone of your travel plans so that they know that you are there and that your card is not being scammed by overseas thieves. They can and will cut you off in the short term.
Travel checks are now a liability rather than useful.
Empty your wallets and purse of everything that has no value to you in Europe (and you may find that you don't need it on you in the USA either).
Lose the Fanny pack. It just screams out to the thieves "Easy Mark here, Rip Me Off".
Travel smart, don't be a victum. You should not have any problems, but in tourist areas anywhere in the world bad things can happen to unprepared good people.
Bon voyage