Here is a map showing 7 signposted walks around Kampsee Thurnberg, a lake 100 kms to the north of Vienna.
Sections of routes 5 and 7 and the whole of route 2 were chosen by a marathon runner, M, who invited me to join him on a recent 20 km training run.
A friendly frog on a wooden signpost showed us the way!
Our run took us through a forest above some cliffs from where we had occasional glimpses of the lake from an up-and-down forest path and later in the run from a technical section of single trail.
On our way we stopped and tasted blackberries. We were bitten by horseflies. It rained for 2 hours.
Some of the hills were long and steep. I found it all mentally cool.
From my perspective M's route choice was brilliant.