If your credit card is one that does NOT charge conversion or transaction fees (one is Capital One) use that. Some restaurants give dollar equals euro if you pay cash.

We usually allow $800 cash per week for 2 people. Great dinners run around $100 for 2. Some evenings we spend less and some evenings spend more. We drink only wine with meals but buy a bottle of hard liquor for the room. So for us dinners average about the $100.

Toward the end of the week we depend on the credit card if we're running short. But we always seem to bring cash home.

If you plan on gift shopping that's a whole other story.