The Titisee is a lake in the southern Black Forest in Baden-Württemberg. It covers an area of 1.3 km² and is an average of 20 m deep. It owes its formation to the Feldberg glacier, the moraines of which were formed in the Pleistocene epoch and nowadays form the shores of the lake.Wikipedia
On one side of the lake the village Titisee Neustadt is situated. Plenty of shops fir a real Black Forest souvenir and restaurants to choose from. The servers dress in local folklore dresses Hotels on the shore of the lake offer a great view.
You can go for a tour on the lake of a trainride in the area. When I visited that fare was included for people who stayed in local hotels.
When you decide to take the train you leave the tourist area behind you in a few minutes and pass hills and meadows and end up at another village on the shore of a hydroelectric lake.
That lake, Schluchsee, has a nice quiet camping on its shore if you like your peace and quiet. Still in like 10 minutes by train you will be at Titisee.