Camping Belchenblick at Staufen near Freiburg and Ferien-Camping Munstertal a couple of miles further up the valley are both excellent, and the area is lovely..
Its been a few years but I agree with Graham's recommendation for Camping Belchenblick. Staufen is also a lovely little town within walking dostance of the site.
David
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Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.