I am setting up a goalpost in the back garden for my son to play football. The area where it is located has some paving slabs and clay on the ground at present. I want to set up the goal area so it is safe for him to save the ball and make dives. I was thinking of clearing the clay and using bark but from reading previous posts this attract cats and their excrement. What else could you use to cover the area around the goal? The garden is a small suburban garden so I do not have a large area to cover.