One day walk on a walk and loop hiking route, multi-day roaming on a long-distance hiking or pilgrimage path to Santiago de Compostela, there are many hiking trails in the Ardennes.
Thematic, historical, contemplative… Hundreds of kilometers are to be covered from North to South, from East to West, along the Semois/Semoy (GR16), around a village (the trades of yesteryear in Renwez) or on the way to Bar-le-Duc, Paris (GR14), Reims (GR654), Bouillon or Arlon (GR16). It's up to you to invent your trip.