Kotor is an incredible small medieval town in the middle of a valley. You can explore the city using a map available in the city information center. The most famous attraction is the hike to the top of the castle where you have a view point from the entire city. I explane here about this hike.
Inside the medieval district you have a few sightseeings, starting with St. Nicolas Church, constructed in the end of XIX century. At night lights are turned on.
Another great building is a Cathedral with two towers, constructed in 1166, the St. Triphon Cathedral.
If you are hungry, a great and cheap restaurant called Labud Tende prepare delicious and huge sandwiches!