A cautionary tale. Leaving Vienna following the radweg along the North bank of the river going Eastwards, it is very easy to miss a left turn and a short distance later find yourself cycling through a quite extensive nudist area.
If you keep going, hoping you'll just get to the end and once more pick up the radweg, you just reach a dead end and have to cycle all the way back
... absolutely proving to the disgruntled nudists that you really are just a voyeur out to disturb their peace !! On the plus side though, if you do have to stop for any reason ... there's always somewhere to park your bike!