Hike of the station trail at the Lindenberg.
Take the hotel bus to the Gallihof Chapel in the Iben Valley (located between Kirchzarten and St. Peter). From there on you walk the Stationsweg over the Lindenberg to St. Peter. And take a look at the church. Afterwards the same way back again. Is a beautiful flower tour.
Walking time about 3 hours and the trips each 30 minutes.