Hmm, wouldn't recommend staying so long in Zadar. You can easily go through the city in one day. Old Town was literally just tourists, saw nearly any locals. Food was not amazing, only exceptions are Pet Bunara & 4 Kantuna.
Anywaaays, here's our itinerary for 4 days in Zadar:
Day 1
The Roman Forum
Bell tower
Church of St. Donatus
Promenade Walk
Sea Organ
Greeting to the Sun
Day 2
Preko Island, 20 minutes from Zadar with the ferry
Day 3
Venetian Land Gate
Plitvice Lakes National Park
Day 4
City Market Zadar
Kolovare beach
Sea Organ
