Trash everywhere. Dirty diapers littering the ground. Condom wrappers at the playground.
Until people learn to be good neighbors and clean up after themselves, perhaps the city could send work crews. There most be some juvenile delinquents who have to do court ordered community service who could do this... Or college-bound high school students who need a community service project to work on.
Also... Step up law enforcement at the parks to fine litterers.