Five kilometers away from Jajce there are beautiful Pliva lakes and in the middle separated with bunch of amazing mills built during the Ottoman era.
Amongst the people they are know as "mličići" (small mills). Today mostly ouf of order but still amazing to see how they split up two lakes.
Io these lakes we would strongly recommend doing some swimming, fishing, canoeing or kayaking (in 1963. World and European Championship in kayaking and canoeing on still waters were held on Pliva lakes).
This is something must see if passing by these areas.