Cooking classes for travelers in Italy is really really popular. Most people I've met over the years officially come to Italy for the art & history - but really they are on a FOOD & WINE mission, eating their way through the country. And what a shame not to take the experience of some Italian cooking back home!
In Tuscany there's a myriad of people offering cooking classes out there, so my idea is to scout out the best Mammas and Papas - to sort of certify the quality by my standards. Perhaps I should explain that better so it doesn't sound like I'm completely full of myself. I apply the same sort of analytic criteria I look at when I go to restaurants or wineries these days. I judge for myself whether the foods are fresh, seasonal and of high quality. If I love the ambience or not - clean & cozy. If the people are educated, personable and friendly.
And, of course, I'ld say fundamental for a cooking class is to participate in the cooking and to discuss ingredients and cooking methods, so one ends up having a great experience and new skills (and a full belly!).