We traveling folk think that a curiosity is something native to a place that we come to look at. Nope! There are some places where a tourists is a curiosity, and a party of some foreign ones even more so. El Kef is like that, though this might stop soon as the number of people coming grows.
Your status of such curiosity will mean that people will be mostly friendly and will be happy to help you discovering the town, though your opinion will be sought as to how you find it. And you’d better not criticize the place to much: but there will be no need for this, ‘cause El Kef is great, and really underrated.