We tried it!
We played for the first time a couple weeks ago. The three of us just bought regular frisbees (all the same) to give it a try. IT was so much fun (although we need to bring something with us to retrieve lost discs from trees!).
We plan to go again. Using the regular frisbees was fine, but we were consistently 2-3 over par on every basket. So, I looked on ebay and found starter sets with three discs (driver, mid range, putter) for about $25. I bought a set for me, and one for my husband.
I just hesitate to spread the word because I don't want it to get trashed.
I'd recommend wearing some good bug spray around your ankles. My husband got a pretty bad case of chiggars.
There was a guy dozing near one of the baskets, but he was harmless. Didn't appear homeless or anything, just someone enjoying a morning snooze in a quiet spot.
Try using Google Earth to see the park. You'll see where all the Flat Tops used to be. Kinda neat. Great way to use an area that was once pretty spooky.