Explain to him that there are many cash machines in the area he is visiting and and offer to order limited currency for the initial part of his trip.
Accept that he is unlikely to want to use cash machines and use that as an opportunity to explain some of the other options that are available to him.
Ask him what he has done in the past when travelling abroad and explain that if he would like, you could explain to him what other options are available.
Tell him that the holiday sounds great then explain the process for ordering foreign currency from the bank and ask him how much he would like to order.