Make sure to go to Chinon and enjoy, it's nice. It's one of our favorite near Paris wine areas and it's very underappreciated by tourists. I'm not sure if the poster above mentioned, but the cafe de la paix picture is also in Chinon (as are many of the other photos, as already mentioned). If you are there for market weekend in the main square, you can buy some pastries or beignets and have a coffee at cafe de la paix. It's a bit of a symbiotic relationship on market day.
Le cave voltaire is a nice wine, cheese, and meat place down a side street from the main square. You can't get many of the wines that he has and he does them by the glass. I'd recommend trying one of his old vine wines plus others. Chinon wine is good and he's an interesting fellow. Do stop by. I prefer his cheese platter to his meat platter.
Les annees 30 is a nice place for dinner and is always busy.
We normally stop there when driving through but the drive there is uneventful/not that interesting. If I were you, I'd take the train.