No dice
This is actually a sign that is against feeding squirrels at the park. Park authorities would advise against anyone doing that because the squirrel could bite or get sick from the food you are giving them. Squirrels may look like they can eat anything, but they have sensitive stomachs like anyone else.
Someone saw this sign and thought that it had the potential to be turned into something else. So they put up the words advising people to not play dice with the squirrels. Who knows what kind of tricks the squirrels know, you may lose all your money when you gamble with those little cheaters.