Wespenstein Castle in Gräfenthal (on the Thuringian-Bavarian border) is home to an unpretentious little castle hotel. In addition to single and double rooms it houses a holiday rental and if you prefer sleeping outdoors you can camp in the courtyard.
Those who want to explore the area by muscle power can do this on a rail-cycle draisine. Lovebirds can get married in the little chapel and afterwards enjoy a knight’s meal in the tavern: