As with the rest of Greece, the currency used in Kos is the Euro. There are ATMs and foreign exchange counters located across the island, but it’s strongly advised that you pick up your travel money before you leave for your holiday. You’ll get a great rate if you visit your nearest Thomas Cook store or buy online via ThomasCook.com. It’s always best to avoid getting your foreign currency at the airport as this normally ends up being more expensive. If you don’t know how much you want to take with you, then why not take a look at the Thomas Cook Cash Passport?