You don’t have to fence it to keep animals out – just to create a clear property boundary so that a person strolling up to your woods will know that this private property is off limits. Put pound-in 1" fiberglass posts every 30ft or so to create a visible line. And where there are obvious paths entering the woods, a post on either side of the path with 1" fence tape hung on these posts. Get brown or black fence tape, so it doesn’t look garish, and I wouldn’t tape off the entire property line. Aside from the cost, would look like crap and require more substantial posts. Last thing you need is a bunch of neighbors complaining to the town that you’ve destroyed the natural beauty of the area.
The logs that you’re clearing for the barn could be piled across the paths on the property line, and over the years, each time you work on the property, keep extending your brush piles up/down the property line. Won’t bother the wildlife one bit- in fact it’s good habitat.
The most obvious source of trespassers is the two sides with housing, so that’s what, about 3000 ft on a 60acre parcel? So, 100 fiberglass posts would be less than $200.
This isn’t going to make you popular with the people who have been using the land as if it’s a public park, but I totally agree with you to reserve it for your own use, and to not take on the liability of other people using it. It’s not a park.
I bet 90% of the people who encounter your fence post line and tape across the paths, plus no trespass signs, will respect it even if they hate you for it. You probably will still get a few violators, but if they know they’re being surveilled, they might stop. Rather than put Camear in Use signs, I’d mount a trailcam along the most common paths, high enough that it can’t be reached without a ladder. Instead of hiding it, do a couple of wraps around the tree with blaze orange ribbon, right under the camera.
Anyone walking past it will notice the blaze and look up to figure out why the tree’s wrapped. At which point they realize they’ve just given you a great photo of their face. Bet they turn around.
( Camera doesn’t even need to be working, they won’t know that.)