Marcourt, at the heart of the Ardenns.
A beautifull area for walking, thanks to the many little streams, the forest and the valleys, and ofcourse the river Ourthe.
Durbuy, 'the smalles town in the world' offers an old-town center with cute little streets. Lots of restaurants.
Does World War II interest you a lot? You should definitly visit the Mardasson War Museum in Bastogne.
La Roche-en-Ardenne is the place to be for all kinds of activities such as kayaking and mountain biking.