McKinley park was a big and beautiful park. Usually at any given time, people were out walking their dogs or children were playing in the park. But, it was mid-week and mid-morning, and other than a few die-hard runners, hardly anyone was there. To anyone familiar with the park, this would be very strange and almost foreign. Particularly, there were no dogs about. But, for the many pets, even those not so famed by the news, there were signs on any open poster area. When pets went missing, people were not apt to let their children freely run a muck on the playgrounds.
As for the rose garden, it was also still. But, the roses were in full bloom and positively beautiful...except for one thing. There were signs up in a few different areas and behind them fresh piles of disturbed ground. There were many ways to enter the garden, but one distinct entrance.
Feel free to use pictures from google as to where your characters will be coming from if you wish.