DS has been fortunate enough to be invited to a friend's house in Greece for 8 days in the summer. Friends parents will be going with them. It is fairly rural so I would presume they will eat at their home mostly, although there is a town a short drive away so could go out too. It's not very touristy so prices are reasonable (friends dad suggested that they can get a healthy portion of gyros for £3 for example). How much would you give the parents towards food? DS would have spending money for if they went out on trips / ate out etc, and we've obviously paying for his flight. DS and his friend are 16 if that makes a difference. I don't want to offer too little or too much!