Kevin asked about where to hunt for lost stuff.
Good question.
First off,, a lot of places are private property,, so asking permission is required. And while it may seem like there isn't much to be found on private property,, it can easily surprise you.
A little research may uncover a lot of old history on a place that isn't too well known.
Here in the south,, old civil war plantations have a lot of history,, and treasures to be uncovered.
Public lands.
One of the more common places a lot of folks like to hunt,, are ocean front beaches. USUALLY the beaches are open to the public, AND no permission required. A simple check of local ordinances can provide that answer that question. Getting into the water, as a wader,, usually ok as well. SCUBA may violate a registered salvage claim. (This is common in Florida.)
Local parks, you can ask at County offices to see if they have any ordinances. Sometimes there may be regulations on how you did or leave the property. (Think; No holes left behind. always cover your holes.)
The fun part of treasure hunting is the discovery of history of an area. One of my more enjoyable places was when I asked a church once about where they did baptisms. I discovered that the creek place they used to use had once been owned by a family member. (I didn't find much by the creek, but where they used to hold outdoor picnic's I did find some old coins.)
A few rules most of us follow.
Always ask permission.
ALWAYS cover any holes & leave the area looking as if you were never there.
Always take out any trash you find.
When asking for permission, always offer to share your finds with the owner of the property. ESPECIALLY if you find something of family historical value.
If asked to see if you can find long passed family members wedding ring,, do so willingly, AND of course, return it to the family.
When offered a reward for finding & returning a lost item,, politely decline. But usually they will insist you take one.
Lastly, be HONEST in dealing with other people's property.
With that,, I can say that metal detecting is fun, relaxing, and occasionally profitable. Yet,, it can be frustrating to a new user who fails to READ THE INSTRUCTIONS,, and improperly set up their detector.
That,, and the fact you WILL dig a lot of trash to find a few good items. My favorite saying is; "You will dig 1000 pull-tabs for just (1) good ring."
Quite often, I can spend a couple of hours detecting,, and maybe only find a few dollars in modern change. BUT,, if I find a spot,, that is older, never hunted,, and has history,, the finds often are much better. Silver coins, gold jewelry, civil war artifacts etc are getting harder & harder to find,, but are still out there. I found a silver dime in a well hunted spot about 3 months ago.
You just never know where or when.