My teenage son is off to Greece with his mates post A levels. They’ll be in an AI hotel, but will no doubt need money for a daily newspaper, historical site visits and ice cream. Heavy sarcasm, obviously it will be booze out of the hotel, boozy boat trips, banana boat fun, hangover & sunburn meds. Can anyone advise what’s the best/safest/cheapest method of cash/money - all cash? Card / prepaid card etc.