Meeting point is the parking lot at the end of Alsbach towards Alsbach castle. Opposite is a "Kneipp-Anlage" (Sorry no pub - you can use it in summer time to tread water)
Driving instructions: Drive until you reach Alsbach (A5), follow afterwards the signs towards Alsbach castle at the roundabout
Public Transport: Use the tram from Darmstadt until the end station Alsbach. Please follow the signs into the city center where you'll find the roundabout easily. Follow than the driving instructions.