Fancamps, Fanfests and Ticket Exchange for the World Cup 2014 in Brazil

Me and 5 mates will be coming to germany for the world cup and were wondering will it be possible and safe to leave the campervan at camp sites for a few days. We are looking on travelling round different parts and do not want to drive everywere as more than likely will be drinking for a lot of days...

I was just wondering what everyone is doing for cash whilst they are over there.

Will there be anywere on the site to change travellers cheques and how much will it likely cost?
and
is there a charge for drawing out money from cash machines?

Cheers