Sigmund Thun Gorge was okay, but honestly something we probably could have skipped. The gorge and…read moreman-made waterfall were nice to see, but it wasn't a must-do for us compared to some of the other things in the area.
That being said, if you're looking for something inexpensive to do while in the area, it's worth considering. Admission was under €9 per person (around that price), so it's a pretty cheap activity and a nice way to spend a little time outdoors.