Man, I know that place well and have been there many times.
I scoured the curb strip on both sides, hit the grassy areas where the picnic tables are and further in, even the large grassy area behind to the right where you stood and took that pic.
I found tons of clad, some junk rings and jewelry, nothing in precious metal from what I can remember but a few older wheaties and several pot pipes in my travels.
I also found plenty of coins in that wide blvd. but in the heat of the summer sun not much fun to hunt there so I tended to stay near and under the trees along the sides.
Our club had meetings there all the time so the place has been searched well but there is still plenty to be found.
I was searching that big grassy area behind you that I mentioned near the sidewalk at one of our meetings and got a huge and loud signal so I got curious and dug it.
About 8" deep I found a big bronze memorial plate that had the name of a tree and a name of a family that dedicated that tree.
No hint of a tree in that area at all and not even a stump but there was one there at one time in the past.
This large, thick and heavy plate was cemented and anchored in the ground well so no recovering this thing but it would have been cool to dig up and give to the parks dept. If I could.
To the left of where you were standing up and over the hill in the flat area where the big statue stands, the one named Pioneer Women I believe, is an area with a huge amount of trash but members of our club have found lots of great rings there in the past because this is a site where they have concerts and thousands of people have hung around all over that area.
Foil, tabs, pop tops and can slaw galore but some decent jewelry hiding in all that mess also.
If you go straight back on that road behind you to the main street you will pass the fenced in dog park area before you leave the park.
That area is where some homes used to stand long ago and where many veterans and their families lived after WW2.
On the other side of that wide Blvd.on your left at the end where there is a small parking lot and a few picnic tables is where we held our meetings and also very trashy but I have found lots of coins and some decent jewelry too like a titanium ring.
Here is a long and funny story about that ring I found after one of our meetings in that exact area.
http://www.findmall.com/read.php?91,2085153,2085257#msg-2085257
I loved this park, lots of history, lots of fun hunting it and now I live about 800 miles away from it but I will always have those memories.
As much as I and everyone else hunted there I am sure we left you guys plenty of great stuff to find so hit it again sometime.