It is the largest city on the Turkish Black Sea coast and the largest port of the Black Sea.
Firstly, you should visit Bandırma Boat. Independent War had started in Samsun, Bandırma boat by Atatürk. In Bandırma boat has a lot of historical photographs about Atatürk and his friends. You can read about the war and watch a short film.
Other places where you can see, Gazi museum in Mecidiye and Etnografya museum nearly Cumhuriyet Center. Gazi museum tells you about Atatürk’s life in Samsun. You can see his clothes and his special things and you can see historical and amazing objects in Etnografya museum.
Absolutely you should see the sculptures like lively person in Cumhuriyet Center. They are wonderful.
You can come out Amisos by telpher with beautiful Samsun view.
Maybe you can do some shopping and you can by traditional things about Samsun or Black Sea.
Pide is one of Samsun's delicious 'events' and has four different types available Kapalı, peynirli-yumurtalı (cheese&egg), pastırmalı-yumurtalı (spicy bacon&egg) and sucuklu-yumurtalı (Turkish wurst&egg) although there are some further varieties also possible such as spinach, kavurmalı etc.
The local people all eat pide every Sunday almost ritualistically.
These pides are totally unique to the city, so don't expect to find them anywhere else.