we actually didn't get married at a winery, but did a wine tour the next day. We went to Franciscan, V. Sattui, Diamond Oaks, and Peju Province. All are on the main highway in Napa.
10 in one day, are you tasting at all of them...holy cow you all will be wasted, but that will be fun.
We did a private tour at V. Sattui and they took us in the back where everything is actually made and stored, very cool.
I would recommend trying to get a cave tour in somehow if you can. I have never done that but my aunt did one time and said it was amazing.