There is a fairly big campsite nearby to the town, we had a look around while we were there and seemed very well equipped, shower and toilet blocks even its own pub on site.
There was a lot of dutch people staying here, so it must be good.
The river runs around the campsite itself.
Equipment: The Usual camping kit.
In winter, it is a ski lift but during the rest of the year, it doubles as a way for you to get up the mountains above Altenahr for what I presume must be great Eifel views - we never had time to test it. Up here is also where the "Red Wine Trail" of the valley starts.