Yep. Stands cost time & money. Destroy their time and money
They will get the hint, but they will also attempt to extract revenge. I think I'd just steal the deer stands, and leave as little trace as possible. Then they will assume another hunter took it, wearing themselves out looking for it elsewhere on the premises.
Brush piles for sure! The best barricades are built with piles of trees & logs, 'cause they don't cost anything, there is no disposal fee years later, and the bad guys don't cost any significant damage when they saw their way in. Just add more brush & thorns, if you can.
You might consider planting some invasives, too. Very few people will cut their way through a row of multi-flora rose. I grew up around them, and you definitely won't ever go through a row of that stuff without a lot of work and personal injury. And they really aren't that invasive, either; once you get a row planted and growing well, I've never seen them spread from that spot if they get maintenance-mowed right beside.