note: it now costs 15 euros (we have not used electricity, filling up with water is an extra charge). we registered by phone, lady asks to put the exact money in a box and with the pin you get a document folder with, among other things, your own key for the sanitary facilities. And a coin that opens the barrier when you want to leave. It's a quiet place. Pirna has a cozy Altstadt, you can walk / cycle along Elbe