Frankly, discovering the region from the water is TOP. The ideal months are from November to April because otherwise you risk hitting rock bottom. With my 7 year old son we entered the water in Maboge with our own inflatable kayak, no difficulty. If you prefer a little more adventure, enter the water at the Nisramont dam. Fun guaranteed. There are also several organizations that can accompany you and / or rent kayaks.
Ardennes-Adventures
Brandsport Adventure
Outdoor Center
Wildtrails Basecamp