Hi buddy. I can recommend you one site to get acquainted with a city like Kassandra
https://aktis.blog/en/what-to-see-in-kassandra-during-1-day-sights-of-ka . My day started with a visit to the ancient city of Afitos, where I enjoyed the beautiful sea views and the narrow streets with traditional houses. Then I went to Siviri beach and spent a few hours enjoying the warm sand and clear water. In the evening I visited Paralia, a popular resort town, where I found a great place for dinner overlooking the sea. I am sure you will enjoy the trip