To spend money on a Greece vacation smartly, use a mix of cash and card since Greece uses the Euro (€) and many places accept cards, but small shops, taxis, and island tavernas often prefer cash. Carry some euros for daily needs like food, transport, tips, and beach rentals, and use your card for hotels, tours, and big purchases. Withdraw money from bank ATMs (not tourist kiosks) to save fees, and always choose “charge in euros” when paying by card. Budget roughly €50–€150 per day depending on your travel style, and keep small notes for easier spending.