On your first day in Tokat, you can visit Tokat Museum first to discover the city and understand its history better. You can get out of here and visit Sulu Street, which is right across the museum, and you can see the historical Tokat houses here. Afterwards, you can visit Hıdırlık Bridge, a work from the Seljuk period, which has become one of the symbols of the city. You can stop in Gök Madrasah, which has the characteristics of Anatolian Seljuk architecture and is used as a bimarhane (old Turkish hospital) and hospital; then you can take a meal break and enjoy testi kebab. After eating your dish, you can go to Taşhan, one of the biggest inns in Anatolia.
You can see Tokat Castle, where Byzantine Emperor Diegonis and Vlad III (Drakula) were imprisoned in the past, from all over the city. Finally, you can visit Tokat Clock Tower, Bey Street and Mevlevihane Museum in that area and end the day with a coffee in the bazaar.
First, you can head to Zile to see Zile Castle, where Julius Caesar said "Veni Vidi Vici (I came, I saw, I conquered)" to herald the victory after the Battle of Zela. After this visit, you can visit Kaz Lake and Mahperi Hatun Kervansarayı (Caravanserai), and Ballıca Cave famous for its stalactites and stalagmites which is on the UNESCO World Heritage Tentative List in Pazar district. When you return back to Tokat city center, you can eat bakla dolması for your lunch break. After exploring Deveciler Inn, the historical trade center of Tokat, Yağı Basan Madrasahs, Suluhan, Paşa Inn with a short walk after lunch, you can visit Latifoğlu Mansion, Gök Madrasah, and take a boat tour in Yeşilırmak. If you want to spend some time in nature at the end of the day, you can go to Kaz Lake.