The centre is easy enough to get around on foot. To reach the bus and train stations or Youth Hostel you will probably need to catch one of the frequent local buses, which are the only form of public transportation.
Buses in Zadar are relatively new and well maintained, and you will be able to catch a bus to any part of the city from the main hub in the city called Mala Pošta Little Post Office; ask any local where this is and they can direct you to it. A bus ticket in one direction costs 8 kuna cca. US$1.60 while a two way ticket costs 13 kuna cca. US$2.50. However, 2 way tickets are only available for purchase at newspaper stands, although they are easy to find. One way tickets are available for purchase upon entering any bus.
Do not attempt to board a bus without a ticket, without purchasing a ticket or avoiding stamping a bus ticket. Bus drivers in Zadar are notoriously militant about enforcing payment, and you could get into trouble.
Also, be advised that bus services cease just after midnight during the summer, so if you plan to get back to a hotel that isn't close to the city center after that time, you might have to walk or catch a taxi.
