We made a stop somewhere in the river and went for a walk along the huge rocky walls.
You can see how huge?
You can see how huge!!!
Also wherever we went, mountain, park or even from the rocks, we were met by wild japanese lilies. These have the largest flowers of any lily species in the world. And they smell heavenly.
Highlight of the day was the trip on the boats. Not sure right now about the name of the river (Tengawa?) 
We floated on the river accompanied by huge koi fish and guided by the entertaining oar-dudes about the nature and the history of the place.
It was very quite and magical and relaxing. The view of the river between high rocks was amazing.
We could see an odd shrine hidden in the rocks.