Outdoorsy types tend to head straight for the Ardennes, Belgium's year-round outdoor playground. Here you can ski in winter and in summer kayak or go hiking or mountain biking (using a vélo tout terrain, or VTT) along a good network of forest tracks. Another worthy attraction are the prehistoric limestone grottoes and caves in the area (particularly around the towns of Han-sur-Lesse, Rochefort and Dinant), which offer plenty of scope for subterranean explorers.