For someone who has only been in Mostar once, this question has at least 10 answers. The first step you take in Mostar will be a walk through the Kujundžiluk because from there you can go anywhere else. I would be great if you had the opportunity to visit a poetry events where you will have the chance to hear some Aleksa Šantić poems, because through his verses you would only see the true beauty of Mostar.