I didn't have any clue - should have consulted the Internet before leaving. But mtbikeroz had the coords. So, we stopped just before we arrived at the picnic ground.
Personal best? This is difficult. We mark all outstanding caches on our personal website http://home.arcor.de/felias-fogg/found/ , but it is hard to say, what the "best" one is.
The funniest one was definitely "Walddusche" (forrest shower) http://www.geocaching.com/seek/cache_details.aspx?wp=GCKA1T . The log condition is that you take a shower and post a photo of it. The water of this shower comes from a small creek and is very cold! So, it is good for warm summer days. In order to give you an impression, I attach two of our log photos.
Thanks to winglen for this cache and to MBO for showing it to me - Fogg