What would you do?

[Tink]

In a few days our survey to draw out the boundaries of our lot will be done.

My dilema is this: Our fence is going to have to go up quick so the markers driven in by the surveyor aren't tampered with, and it's very possible that it will shut them out of a large portion of their vegetable garden. There's also a large patch of raspberries on what will "likely" prove to be our land. The raspberries were there long before either they or us moved here, so I see those as a bonus for us.
Their veggie garden is a different matter.

We can fence them out, and I suppose legally, prevent them from tending or harvesting anything on our land. However we're going to still have to live next to them for a while.
If they were decent neighbors, I wouldn't even be asking this question, because we'd just let them finish out the year.
Since they've been anything BUT decent, I hesitate to let them step foot on our property for ANY reason.
I expect the question to come up as soon as they see the surveyor out here marking the boundaries. They have no clue right now what we have planned and we don't plan to tell them ahead of time.
Naturally, if they get threatening when they find out about the survey, there's no way they'll have any chance of getting near the garden. But on the long-shot that they act civilly, what would you do? Let them in to tend and harvest? or Shut them out completely just to be done with it?