I feel lame for these worthless contributions...but 2 local courses at my house have little "local only" known secrets:
One being at Riverside, right after hole 18, if you go up by the road where the yellow fire hydrant is, there is an unmarked "hole 19" where you launch from the dirt pad next to the hydrant, back toward the basket from hole 17. Obviously you don't play this hole if there are a bunch of groups behind you, but on a slower day, you always gotta play hole 19.
Also, Old farm park, Hole 12, if you go back behind the tee around some bushes to the right, you'll come up on an emptied cement sewer run-off type deal, and there is a spot to tee of from there, that we call the pro-tee, (even though its as boot leg as it gets)
Wish I had some better stuff to add. Great thread BroD.