There is no walk around the lake as walls of sheer rock rise up to 3000ft from its shores... Malerwinkl and Rabenwand are great view points at the north end of the lake, though. They can be reached on a modest walk on well marked trails from the lake promenade where the cruise boats dock.
Thank you! That's what I am looking for. Just a place to take photos and take in the beauty.
There is also a nice little covered bridge to get a few photos of and at. I think it's called Fußgängerbrücke (überdachte Holzbrücke) or so. Oli help be out.
It's very close to the main area, where the boats launch. Less than 5 min walk.