Wiesbaden - Reisinger-Anlagen

Directions:

Maps: https://goo.gl/maps/7MhdSuS3SR72

By car: find your way to Wiesbaden - Kaiser-Friedrich-Ring. 
Parking options next to the Reisingeranlage along Friedrich-Ebert-Straße or Bahnhofstraße or use P&R option at Hauptbahnhof (paid parking). 

Public transport: Take any S-Bahn or regional train to Wiesbaden Hauptbahnhof / main station, get out the main entrance and walk across Kaiser-Friedrich-Ring to get to Reisingeranlage. 
The meeting point should be in extension of Lessingstraße in the middle of the green.