This was transwikied from- http://lifeafterpeople.wikia.com/wiki/Playgrounds
1 day after people
Cars sit empty on parking lots of playgrounds everywhere around the world. Birds and squirrels are the first to arrive, making homes in jungle gyms.
1 year after people
The paint on various rides and jungle gyms flakes off. Plants have colonized the playground.
10 years after people
Playgrounds around the world are starting to show signs of age. Termites have chewed at wood that supports the plastic and metal. The metal itself is starting to rust.
50 years after people
The rotten wood and eroding metal can no longer support swingsets. They collapse and start become buried. Meatl does not rot, but rusts. Most metal rides have been brought down by now. However, plastic does not rot or corrode, thus will remain long enough to be a last reminder that humans were once here.