Pay smartly
You are not really gonna find places to exchange currency outside of the airport. Plus, it's a pain to count it and change accumulates fast in the pockets. Use cards. They work even to access public toilets. If you wanna be extra safe, use Apple Pay or Google Pay. It's the best possible choice: safe and effective, it will ensure the cards are never rejected (or lost!)
Go check out my guide for the best free things to do as well as itineraries and travel tips to make your trip unforgettable.