No you do not need to be 21 to enter just to drink
You can go and do everything at any age except consume the alcohol but you can go on the tours
The drinking age in Rhode Island is 21. However, I did not see any restrictions to walk around the vineyard for people under 21.
No, theres a restaurant and gift shop there as well. Not sure about the wine tasting area but the actual vineyard should also be fine for any age.
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