The river ferry to reach Weltenburg Abbey is very enjoyable and includes a guided talk along the river journey. When buying tickets, be very clear about whether or not you want a one-way or round-trip ticket -- the cashier did not appear to speak much English. If you want to hike back (or there) you only need a one-way fare. In order to enjoy the hike, you will be dependent upon another much smaller ferry to cross the river to the hiking trail. The grounds of the Abbey are nice, but not as extensive as I would have expected. Not much of the interior was actually available for viewing; that was disappointing. We were there just a month or so after some serious flooding and the chapel had a very strong mildew smell. The bier garden in the center of the Abbey grounds where we ate was staffed by mostly cranky waitresses -- very unfortunate. Although the food was good. Perhaps a bit more research before visiting would have been advisable.
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