Wine and olive oil sampling in Istria is worth whatever time you can give to it. The wine is as good or better than much of what you'll find in southern Europe and the best of it never leave Istria or Dalmatia so if you can get there and visit the vineyards, you're in for a treat.
We happened upon an olive harvest and shared with the group their fun more at us I think but we did not really care. It's a novelty for us who did not grow up in olive growing countries.
Olive oil maybe a salad dressing for much of the world but in Istria it is a religion. Hours can be spent assessing colour and aroma.