Its still in an old fashioned fun fair that looks to be dated from the 1940's - drear & awful but rather iconic for all that - & popular with old folks & parents of 5-7 years olds. In fairness they do have a newish ride that is the highest chair-o-plane ride that whirls around 117 metres in the air - why would anyone want to do that?
The Park was created in 1766 & after the ferris wheel was erecte in 1895 it evolved into a classic funfair.
The Danube is a few miles out of the city centre & the metro stops on a long island that is a popular leisure spot for the Vienenese. People were sunbathing, swimming, cruising in rental boats & parts were lined with alfreso riverside bars & restaurants. The river seems very clean (saw a terrpin) but it wasnt any 'bluer' than the Thames - less muddy brown maybe but couldnt see the Blue Danube.
It was a lovely spot with a delicious river breese & it was nice to find where the Viennese go when they abandon the city centre to the tourists.