The currency in Arillas is the Euro. You can exchange traveller’s cheques and sterling either at banks, foreign exchange facilities or the ATM machine in the village.
We would however recommend that you buy your travel money before you leave the UK. You can buy Arillas currency online or from any Thomas Cook branch. Find your nearest store here. If you’re not sure how much money you want to take away with you, then why not check out the Thomas Cook Cash Passport?