You will want to wear a good neoprene dry suit here as the water is icy even at summers. Rhineschlucht is right below lake Cauma Flims, but Access is from Versam, Bonaduz side. It is a riverraft kajaking site here.
Via Mala is a gorge upon Thusis to Andeer. It already gave the Roman empire a challenge and has a Long history. The Swiss got the gorge, but the Austrians got the creativity to make the most stunning theme restaurant about it at Liebes Rot Flüh.