You see Maps and Key Locations of Vinyards with age and experience, they accually receive medels and would be helpful to know which ones have received gold, silver, and bronze, and on which grapes. So if even if its a good grape it may not appeal to you. Also, rate the decor - to they have outside seating to they accept weddings, big parties etc... and service - I have been to a lot of wineries and some have good wine but snobby service can offset the wine.
Andrew J Iadeluca