Superb waterfall. A natural swimming pool allows you to swim. The access path runs along the river and is very technical (fording, etc.) but the waterfall is worth the detour and is not very busy.
Nice picnic area at the Cascade aux Ecrevisses, which is used by locals on weekends. On the other side of the street is the parking lot and the very short walk to the waterfall with natural pool.
It is very idyllic, the path here is interesting and fun. You don't have to be afraid of getting dirty. I wouldn't swim in the water, though, as all kinds of insects and parasites are bound to live here.