The boat trip is for free with the Hochschwarzwald Card and takes 1h15 if you make the whole trip. The lake is not so cosy as the titisee lake, of course because it's much larger.
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We did this while in the area and we enjoyed it immensely. It wasn't too expensive and it's our understanding that if you're staying in the area, you get a tourist card and this is free. Either way, it's a great thing to do. You...More
A nice way to spend an hour boating around the lake. The boat is new, well equipped including a cafe. If you have a guest card, you get one free trip a day - although beware if you hop-on, hop-off the second trip isn't free.
This boat trip makes a few stops around the lake. We took it for a scenic little tour, not as transportation. It was pretty nice, though it was quite busy when we went, so seating was limited.