Look for a nearby parking place, if needed. The ~5 km long walk lasts circa 90 minutes by foot. Find the wanted information during your walk along lake "Gondelteich" and the old town wall.
The Gondelteich, a small lake, is located approximately 150m north of you. How many trees do you see on the island on the lake? = A
Now follow the old town wall north until you reach the 6th round tower (waypoint 'TURM6'). On the way collect all missing information.
Laying of the corner stone of the town wall's extension and reconstruction was on _ _ . _ B . _ _ _ _.
The 6 round towers were built in _ _ C _.
The tower of "Bonifatius" church was built in _ _ _ D.
The woad stone (Weidstein) was displayed for the first time in _ _ E F.
The woad stone was newly erected in _ _ G _.
The town wall's restoration began in _ H I _.
Now head to the water tower at N51° 10.GBC' and E011° F.HD3'. At the water tower you can see a four-digit building number. Double the checksum of that number and you'll get JK.
Head to north-north-west to river Unstrut and follow the river upstream. At the river bend you'll find a footbridge. Find out the GPS coordinates from the end of the footbridge. Now you're able to get the approximate final coordinates:
N = 51° I.EAJ'
E = coordinates of the footbridge minus 00° 0.0JK'
From there head approx. 25 meters east until the following is true: The cache won't get wet from above.
A hint for your way back to your cache mobile: Dog owners should follow the river Unstrut south until the next bridge and then walk over the meadow. Those who walk the way eastwards cross a small bridge (Stadtparkbrücke) and go over the market place back to their cache mobile.
(by the way: hints for errors in the translation are always welcome :o) )