Public Transport: Sooo simple… Take RB 12 from Frankfurt main station direction Königstein, after 19 minutes get off at Kelkheim (Taunus) - Munster Bahnhof. From the station start walking Zeilsheimer Straße "north-west" (running direction of the train), follow the directions of Google maps. Walk approx. 1,2 km, no other way.
Walking map: https://goo.gl/maps/mbnjhTHeFtTmhYDs5
Car: Entering Kelkheim via B519 or L3014 (Kronberger Straße). After about 1k turn right onto Frankfurter Straße. Turn left after some 250 m onto Lorsbacher Straße. Drive the street up until you see a big parking lot on the left side.
Lost? Ask for Waldseilgarten Kelkheim, Halligalli Kinderwelt or Kelkheim Schwimmbad :-)
Coming from A66 (Frankfurt area or Wiesbaden area): https://goo.gl/maps/kN3MwHhPX21R3Zu57