Thanks!
Found it in a heavily pounded park right next to a rusty nail, still gave a sweet signal on the ole Bounty Hunter!! It was only about 4 inches down.
The key to hunting local parks, from my limited experience, is to find places within the park that don't seem like the obvious good place to hunt. It's my first instinct to hit up the base of huge old trees, which is a good spot, but everyone else has the same idea and they've been hit up over and over again. I look for places that are a little harder to access or are a little tougher to hunt, like steep slopes, little nooks and crannies, along sidewalks or any pathways, along any little stone walls that people could sit on and have change drop out of their pockets, any place a little off the beaten path, try to be creative, think of where you wouldn't want to hunt, then hunt it. Remember that in the older parks, things may not have been set up originally the way they are now, the layout of the park may have changed, equipment added, dirt moved, old buildings taken down, new ones put up....the high traffic areas change as the park does. My machine doesn't detect as deep as the high dollar units, so I usually have to get creative to pull out the goodies. I also like to find areas that have only a few inches of soil, and then rocks underneath, this keeps the old stuff from sinking too far, and people don't usually like to dig in the rocky soil, so they avoid hunting it, found my first Barber in an area like that.
But, if you can get permission to hunt houses, that's by far the way to go!! Pretty much the only way to find good virgin soil without having to do a ton of research.
Good luck!