While on A66 from Frankfurt direction Wiesbaden or from Wiesbaden direction Frankfurt, take exit Frankfurt-Höchst onto B8 towards Königstein.
Drive all the way up to the end of B8 and turn (right) direction Königstein.
Still on B8 / B519 go straight, passing one traffic -kight and one exit on that road.
At the third exit take a right direction Bad Soden / Bad Soden Neuenhain (it will go down).
Drive down that road for about 850 m and you will see a parking lot at the right hand side next to the road. A few more meters you will see a restaurant (Waldgaststätte Hubertus) on the left hand-side and further, there willbe a traffic-light - but than you are gone to far!.
Take a look on Google maps: http://goo.gl/maps/dzm90
Alternative, you could drive all the way straight and up the hill through the town of Bad Soden, until you exit the town again.
Therefore take first exit off B8 after you just came from A66, signed Sulzbach - Bad Soden (the one before Main-Taunus-Zentrum) and cross 3 large junctions with traffic lights until you enter Bad Soden.
Drive all the way straight through "downtown" Bad Soden on Königsteiner Straße (mainroad), passing some petrol stations, a roundabout, the Park and then it goes up, up the hill. When you are about to leave the town again (Neuenhain) still go ahead and after passing the traffic light and restaurant the parking will be left-hand-sided in the woods. Watch out for hash signs.
Or just look here (alternative route): http://goo.gl/maps/3Q4sR
The maked point on the enclosed map is the parking of the restaurant, the described parking is some more meters on the other sode of the street.
See the timertable above.
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