Yep...what Lloyd said...Gold is a cruel Mistress, park gold especially, once you got gold fever, there is no cure no matter how much you find, its not enough!
To really 'up your odds' come up with a very fast retrieval method and focus on junk (I use a screwdriver ONLY, no pinpointer either, a guy has to be fast!)...foil up into zinc signals are your target..commit yourself to learning what your parks are telling you, if you are finding lots of clad and tabs and nickels, you are in pay dirt! Hunt chains...thats where the money is, most dirt chains have had a coil over them a time or two, but the signal either was disced out or considered trash...
Forget about deep targets, you gotta cover a lot of ground fast and just grind out a couple of hundred targets per day in good pay dirt parks..take a quick perusal of Craigslist for "Lost Rings/Jewelry/Gold"...this will say a lot about your local demographics and where the gold is NOW being lost...guess what? Its primarily in parking lots and restaurant bathrooms etc..That said, for Park gold, you are hunting GOLD lost in the 60's and 70's era!
Theres no money in the little 2gr 10ks.(foil)..you want big gold and a lot of it! Nickel on up signals...Grab all the clad, even pennies, you can knock down more money in clad than gold truth be told...if you are getting 10k+ clad coins per year, you are hunting! Clad will also keep you motivated and tell you about the travel patterns and your odds, soil conditions, age and depth etc...
Looking back, concerning park gold, I have never once accurately 'called it' prior to the dig...sure, some signals are exactly what you want in exactly the right place for it being gold, but it seldom is...chains are the exception, scrappy signal all around, so focus on location and demographics!....Read as many posts as you can from the Park Gold Hunters.
....theres no magic settings or tricks except paying attention to what your scrap finds are telling you, you can just as easily find it with a low end rig as with a top shelf detector...
One year, I logged over 100 miles swinging coil gold hunting in July alone with no results, then, BAM! So you have to be optimistic, and not give up...hit hard fast and often! and actually have dreams about your parks and where it may be hiding...the trash will point the way...Hunt where others dare to tread, like Lloyd mentioned...under benches and in the trash...pay attention and dream about it, watch people that wear gold, see how many gold chain wearers you can spot in a week, then try to hunt that demographic...Gold will be there for you if you dare go after it...its a fools errand, but every once in a while, even a blind nut finds a squirrel...
Good Luck!
Mud
ps: I have found NO gold yet this year, after probably 200 miles on foot and 10k targets popped, so take this all with a grain of salt...I will dream about gold again tonight, and be up and out tomorrow hunting it though.