I used to have a family directly across the street with a sloping driveway ... and a young son (12-13 yo) with young friends who skateboarded.
They built a little ramp and would fly over the ramp, down that driveway, into and across the street and land on my apron/driveway ... and close to any cars parked there.
I tried everything. I told them I was afraid for them and asked them to stop. I told them it was really hard to get blood off cement I suggested the park and they said it was too far to walk with their boards. I overheard of the friends say something profane about me ... so I told the Mother. She told me to tell the Police .... and then she ended up asking the Police to watch out for them doing that while she was at work.
It did stop ... and eventually they moved.
Any chance you can contact the Police and mention that the kids are endangering themselves on your property?