The rifle range idea is pretty good. Or anything you can do to be the 'CRAZY NEIGHBOR GUY' would probably be real fun.

And I doubt that the area's best lawyer could be better than documented proof of tresspassing.

IFyou are going to do the spike in the ground or roofing nail trick, make sure to do it very inconspicuous. The best tricks are the ones where you aren't to blame.Have your fun, and yes, it is fun, but you don't want to start battles with the guy.