Our family we'll be staying for 7 nights in Bad Krozingen in August.
We like nature, castles, old towns and churches (not so much museums)....
We'll have car.
I was thinking to have trips:
1. France (colmar, Strassbourg)
2. Switzerland (Basel, Lucerne, maybe Bern)
4. Optional Hohenzollern Castle, Mainau (a little bit too far)
What other nice places you'd recommend to visit?