Playgrounds in Peterborough

Hi all. I'm going to be looking after my two year old grandson in the next few weeks when his baby brother comes to live with them (isn't that a brilliant way of explaining it?). I'm trying to find places to take him that are accessible without a car and which will wear him out. I can't seem to find many local playgrounds in the area though. They are in Orton Goldhay. Does anyone local have any suggestions?