OP - I know you've heard it, but the only answer is a fence.
Maybe 50, or even 30 years ago when it wasn't so crowded, who needed a fence except to corral the livestock or your children?
Now, we are so crowded and there isn't any more land being made, so the only way to protect or keep what you have is to put a fence up.
As a homeowner, I get up every morning and go to work so I can pay for the right to live in that home. Twice a year I pay property taxes on that property.
I keep my property safe and looking nice. If it's nice out during the warmer weather, I'll prune, weed, plant, water, etc. just to keep my property looking nice.
It is My Right as that Homeowner,
the person who is paying the mortgage on the property,
the one who is responsible for whomever walks across it,
to include or exclude who or whatever I choose.
If someone gets hurt on Your Property while traipsing across it to get to the lake, or if someone accidently trips on a rock near the shore and drowns, guess who the family will come after?
And guess what they'll say when they're in court:
"The homeowner should have had a fence.....My son wouldn't have went down to the pond/lake after dark if there was a fence...
The homeowner should have known that something like this might have happened, they should have put up a fence since they knowingly purchased property adjacent to water/pool.....
BTW, here in our town if you've got a pool, you've gotta have a fence, it's the law.
And who cares if the HOA president's son is one of the kids trespassing on your lawn? What does that mean? That because he is the president he can forget about any and all laws in your community?
You know, no one likes to be a pushy person, or to become a "trouble"
but remember, if someone is going out of their way to make trouble for you, you are not the one starting it, YOU'RE THE ONE ENDING IT!!!!
I just don't like to see people get walked all over.......I am rooting for you and I hope that you will be able to come to a peaceful resolution. Remember that you are the "victim" here.
BTW, up here on Long Island we have a HUGE problem with Illegal Aliens. Talk about walking through your property? How about walking through your property, taking stuff and then leaving their garbage for you to pick up? I am CONSTANTLY picking up trash that the Illegals dump while walking past my home every single day. I've also called the cops twice because I caught them breaking into my shed. Unfortunately, because it's an Illegal, the police do not do a thing about it
So to protect my yard, my husband's tools and equipment and to keep out any kid or drunkard who wants to take a midnight dip, we have put up a six-foot fence, like most of our neighbors. We've been there done that with no fence, trying to make it seem more "country-fied" by keeping the property fence-free, but as another poster stated, Fences Make Good Neighbors.
Good Luck