For wine tastings the area along the river Mosel is quite famous, plus: the city of Trier might be something for you and there are many vineyards as well.

Around Munich there is Neuschwanstein which was the model for Disney's Cinderella Castle.

Around Frankfurt there is Castle Frankenstein somewhere close by.

Here you can sometimes find cheaper train tickets for last minute deals: http://www.ltur.com/de/bahn.html?omn...i-Bahn-Tickets, unfortunately the page is only in German, feel free to send me a PN if you need help with that