With the exdtension of this WHS to include some German beech forests, I have now visited three of these.
Of them the Jasmund National Park on Rugen Island was the most spectacular, where the forest appears to tumble down the cliffs to meet the Baltic Sea. I reached the Park HQ at Konigsstuhl by bus #20 from Sassnitz station and enjoyed the comprehensive audio-visual displays at the HQ.
The Kellerwald National Park had many hiking trails on offer, of different lengths and grades. I reached the park from Kassel on bus #555 travelling one way via Frankenberg and returning via Korbach.
I also visited Thiemsburg in the Hainich National Park, travelling on bus #27A from Eisenach station. The main attraction here seemed to be the Baumkronenpfad, a walkway through the forest canopy.