I would file a report with the DA's office, the sheriff's department, Police, and anyone else you can get to listen.
I'd talk to your neighbors, and have THEM file reports if he's lurking around and they see him. Trust me, any man who finds some random nutcase taking photos of children in a cul-de-sac is gonna want him OUT! Police don't take kindly to grown men obsessing over children, and I doub't this guy is going to say
"No officer I'm not taking photos of little children, I'm just trying to harass Tony W"
I think you get my point. Don;t lie, just let the circumstances work in your favor by not saying too much and letting the scenario speak for itself.