As he's walking down the street, or more precisely on the sidewalk, he gets an idea. Making sure not to speak out loud by accident, he thinks to himself... "Unless I find a target on the way there... Why not go to the park? I'm sure there's a lot of people there, especially with how nice it is."
He walks down in the direction of the park, keeping an eye out. While he doesn't see anyone, he knows the possibilities are nearly endless at his destination, which doesn't take too long to reach.
Walking in, he starts looking. He could easily hide in a few places, like in a bush or maybe behind a few specific benches. But he kept his mind open. Maybe even the bathrooms would be a good place...