Hi I hope I can help you with ideas being implemented in a very similar scenario over here!
The white house (in picture) has had the same residents for over 20 years.
The line of fir trees spans the whole length of my neighbors back yard.
Where you see I put the White fence posts, more fir trees (in that spot) where removed to lay a pipe in the ground.
I am still undecided what (bush or vine) will infest my white fence posts come summer, but it will be thick and have plenty of flowers to attract bees and hornets to scare the kids away! (and pollinate my garden)
I must add the people in this white house CAN NOT stop having kids for some reason?
My dog stays very annoyed by these people, but doesn't bark too much at them... He learned (my dog) quick they're jerks.
Have fun with it. Good luck/life!