silver and gold

Hi, I'm new to metal detecting and am wondering if a 1909 park is a good place to find silver and gold and jewelry. It's not a huge park but a good size, it get a good amount of traffic. I saw a guy metal detecting there once. Also, what are the best places to look? Under trees? Picnic areas...

So we went out to hit a spot for "Sandstone gold" Placer gold from the pleistiocene Gorgeous 95 degree weather.. lol drank 5 gallons of water ..kiddos melted .. no one wanted out of the shade except the wife! YAY! lol but as we topped the mountain we found a huge pile of ore chucked out during...