Istanbul's metro system is a quick and cheap way to get around the touristy parts of the city. It…read moreis not as extensive as many other cities, so if you are not going to a main attraction attraction or square, it could be more convenient to take a taxi. Also, keep in mind that their system does not 24 hours, except on the weekends. On weekdays, it is only from 6:00am to midnight. When they are running, the trams come by very frequently - roughly every 5 to 10 minutes. They also have a card called an Istanbulkart, where a single ride only costs 3.50 turkish lira.