Most optimal route to visit all libraries

I have always enjoyed playing around with coordinates' data. This time, I decided to try out calculating the most optimal route in case I wanted to visit all the libraries in Tallinn.

It turned out that the route is 66.8 km long when driving and it'll take 2 h and 17 min. By walking, the distance is shorter, 56.5 km but it would take 11 h and 43 min.

Below are both the driving and walking itineraries where the driving route is red and walking is blue.