I actually wanted to see super-touristy Titisee while I was staying in Hinterzarten. As in many locations, there are three levels of difficulty available for the hike (mostly level) back to Hinterzarten. The line for the TI office was so slow that I gave up on getting an actual suggestion and a map from a human. But the routes were on steel signposts downtown, leading to the forest. I will say that I lost the "blazes" for the easiest route, and I think I took the moderate route for much of the way. But due to poor planning, I was wearing rubber-soled penny loafers. In fact, I didn't slip or step out of the shoes the whole way. The hardest part was the short downward slope on the home stretch to my luxury resort in Hinterzarten.
Please note that I'm describing a well-trodden, "easy" area of the BF. You may well prefer one of the hundreds of other options. This was a long time ago, but I was asked to return my KONUS card to the hotel before departure. I think that's not strictly correct.