France
My family and I (2 children aged four and five) stumbled into this place by accident while driving across France the summer before last. We hired two canoes at La Malène and descended the river Tarn. The Tarn Gorges are the deepest gorges to be found anywhere in Europe and the scenery is breathtaking. There are quite a few campsites dotted along this stretch of the river and we ended up staying in one of them. In the evening, as the children were fishing by the river bank, an eagle flew past us with a snake in its beak - magic. There is also a lot to do in the area, from rock climbing to visiting castles or just watching the many vultures that visit this part of the world in summer.
www.ot-gorgesdutarn.com/index-gb.html
To rent a canoe: www.canoeblanc.com