If you cropped the people walking, you'd have no contrast between the relaxing boys and the busy adults, and hence not a very interesting picture. I like this just the way it is! Except, you do need to remove the black line down the right side.
Very good work, Lukasz. Good as Photojornalism too. Maybe some will say you could crop the people walking, but you didm?t mean to shot the boys only, did you? I liked it.