This is a roundtrip crossing a mountain and going back inside a riverbed. You will have to swim some small parts most likely even in hot summer. In the time of melting snow or rainfalls I would discourage walking the riverbed but recommend a canoe. Of course in either case you should take care to have a waterproof backpack to carry your electronics.
In case you want to make an easy hike for the walk back you can take the route I described on my hike to Banjat e Benjës
which will give you some nice views into the canyon – but this is incomparable to the walk inside.
(more verbose description will follow soon)