I went for a stroll in the Prata, determined to walk from one end to the other and back. Halfway (or maybe one quarter of the way) I realised that this park is huge, so I gave up and took a nap. What a way to spend an afternoon in Vienna.
Ps. I noticed a strange thing. Austrians seem to compensate their lack of beaches with sunbathing in the park. Many topless people here. I feel scandalised.