I took Mart (who is a fervent fan of fast flowing water) to see the Rhine Falls, close to Schaffhausen. It was a wonderfully sunny day, and there was LOTS of water gushing past (about 726 cubic meters per second, actually) - we had a great time!
We took several little boats across the river and to the rock that valiantly stands right in the middle of the falls... Now; we've figured, in the course of our different Swiss outdoors activities, that Mart isn't a huge fan of heights... well... it's become clear that I'm not great friends with tons of water coming in my direction while sitting in a little boat...! I could so see it tipping over and us having to swim for our life whilst trying to keep the camera out of the water... hahaha! :-)