Places to metal detect are only limited to your imagination. It will vary somewhat by where you live and the climate of your area. Here is a list of places that come to mind.
Dry Land Metal Detecting
Around the house (silver often found at pre-1964 homes)
Other Dry Land Places
Water Metal Detecting
Some of the above listed sites have older coins and relics, some have more recent coins and jewelry. It depends on the kind of detecting you’d like to do. Some of the older sites may have already been detected, but there is always stuff still to be found. I once nearly had my ears blown off by my headphones while detecting a local park turned baseball field. Two inches under ground was a nice 1937 Walking Liberty half. And I know that field had been detected before!
Remember that some places are off limits or are privately owned. You almost always have to ask for permission before you do any metal detecting at many of these sites. And be sure to pick up and dispose of the trash you find and leave the area looking neat.
If any of you have other places to detect, please leave a message below and I’ll be glad to add them to my list.