There's a large walled park/garden about 2km NW from where I'm staying, so I went to find it. Therein I saw more people running than I had thus far in the whole of Vienna, and lots of people walking dogs of all shapes & sizes. They really love their dogs here, and since most people live in apartment houses, there are signs absolutely everywhere warning people to clean up after their dogs (picture of a cute dog saying "Nimm ein Sackerl fuer mein Gackerl"). And Inspector Rex is even allowed on the tram/train, for the same price as a child!
I found this out because this afternoon I caught the tram 10km north to Nussdorf, from which it was possible to walk up to Leopoldsberg at 425m, 300m above the Danube and which is said to be the northeasternmost point in the Alps. (History question: what is the significance of 12 September 1683 in these parts?) From there the walking trail towards Kahlenberg dipped into a saddle and I encountered something which I think Ricky & Tash would really enjoy (and which needn't cause Kay to fear that her MTBWOC team members might get injured, because harnesses are compulsory): a treetop ropes course https://www.waldseilpark-kahlenberg.at/
Kahlenberg is at 485m and has a 22-metre tower, the Stefaniewarte, from the top of which there are 360-degree views over Wien and the Donau - totally worth the 1 Euro the little old ladies at the bottom were collecting. There was a cycling race going on in the vicinity and I looked it up when I got home; men did 9 x 20km laps down to the river and back up again, while women did 5 (and were rewarded with proportionately less prizemoney). I wandered back down to Nussdorf at leisurely pace, although I didn't stop at any of the Heurigen, and as I reached the Nutbush City Limits I found a statue which basically said "Beethoven lived here", and in fact the tram left from Beethovenstrasse.
In the evening I decided to do something different, and, having sussed out the delights on offer in the Prater (for some reason I rather like the canival atmosphere of amusement parks, especially at night) took the Wienerriesenrad ferris wheel which rises 65m above Vienna, for glorious sunset views of the city, the hills where I had been earlier in the day - although the river wasn't visible - and the colourful lights of the Prater. Basically there are about 30 cabins into each of which 15-20 people can easily fit, and the wheel takes about 15 minutes to go around. But it's also possible to pay 360 Euro for a romantic couples' dinner inside your own private* cabin, and the waiters step on board to deliver a new course at the completion of each circuit.
*apart from all the people in all the other cabins gawking at you, that is.