We had a wonderful full day tour of the Saumur wine region in the Loire Valley. The full day trip was definitely worth the time and money.
The tour featured three wineries: one medium scale operation, one large scale operation (specializing in sparkling wines), and one small winery. Included was a guided tour of each operation, and a wine tasting of several of their wines. At the small winery, we met with someone who works the fields and produces the wines, with detailed insights into BIO wine production.
We drove through many vineyards and were given great information about wine production. We had a nice light lunch at troglodyte cafe, built into stone caves.
Our guide picked us up and dropped us off at our hotel in Angers in a new air-conditioned mini-van. He doesn't work from a script -- he knows his material well. This allows customizing the tour to your interests.
We plan to take one tours from Nantes on a future visit. Highly recommended.