I dunno about picking grapes as I prefer drinking them.
The free aire at San Marino is called Area Sosta Camper San Marino - P13. It's found off Strada Della Baldasserona and it's co-ords are: 43.94082, 12.44215. Please tell your wife that it's a really simple, safe, short, cable car ride, only 200 yards walk from the attached photo, and she will always regret missing it for the views alone. If my wife and our little westie could do it, then so can she!
What will not be immediately obvious is that there is a scruffy little loo block just round the corner. Also free.
Our previous camper, an AutoTrail Tracker is the middle van and behind us is a Hymer. When I chatted to the owner it turned out to be Peejay, a Free Member here, and if he ever sees this post, then "Best regards for your next trip to Greece/Turkey or wherever!"
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