Currency and cards
The currency is the euro. Cards are accepted widely in cities, hotels and restaurants; contactless is standard. Small tavernas, kiosks and some island businesses are still cash-first: carry euros on small islands.
ATMs are plentiful in towns; on remote islands, withdraw before you go. Avoid the airport and tourist-area exchange booths' poor rates.
Prices
Greece is mid-priced for Europe: cheaper than Italy or France, pricier than the Balkans. Santorini and Mykonos in August are the exception: among the priciest places in the Mediterranean.
Museum and site tickets are set nationally; many offer reduced or free entry on the first Sunday of the month from November to March. A combined ticket covers the Acropolis plus several nearby sites: check the culture ministry site for current prices.