Unable to answer "Do you need to pay to enter here?" – FREE temporary service hub for SC-vehicles in summer (hot shower, toilet, WiFi, phone charging area, recylcing bins,...) (RV Park) – https://osm.org/node/7204849985 via StreetComplete_ee 57.0:

This place is vacant and has not had anything here for a couple years

Attached photo(s):
https://westnordost.de/p/201995.jpg