Something no more than a maximum of around 30/ 40 kms away from Krakow.
Ok, so that will take you as far as Bochnia, 36 Kilometers from Krakow. The A4 is already half built between Wieliczka and Bochnia, and I would be very surprised if this section were not completed within the next three years. It is pretty much all small villages and farming communities in this area.
would be interested more in something in the more hectares range
I think you will have trouble finding such a plot. Take a look at the region using Google Satellite, and you will see that the the land is being farmed in very long narrow strips. This is the result of many generations of farmers dividing the land amongst their sons. Some of the plots are of almost comical proportion, for example 15m x 500m, perhaps suitable for farming spaghetti :)
As an example I entered Szarów, Targowisko, and Kłaj into Gratka.com. Almost all of the plots were in the range of 5 - 15 Ar. One of the largest and most interesting was 42 Ar, with the dimensions of 21m x 350m.