We usually only take a few euros to travel with and use our debit card in the machines, usually drawing out 300 euros every third day avoiding commission and keeping the banks charge to a minimum, that covers us eating out, and going out most nights for entertainment and drinks for two.
We always hire a car booked on the internet pick up at the airport, and pay by card, use Auto reisen but had some good info from the forum on who's the cheapest.
In Dec our money seemed to just go!!! We do like going out in the evening makes our holiday, excursions not really our thing, if you want to go to theme parks etc you will certainly spend a lot more, most of the bars and restaurants are very competitive, we've found it's cheaper to eat out than trail to the supermarket. hope this helps