Question for yall. I have an appartment complex with a playground area. The base of the area is filled with pea gravel. The kids are kicking it out into the lawn and making a big mess with it. Last week we hit a piece and broke a window. She wants other suggestions of what to put in there if they took out the pea gravel. Things to think about: She is worried about bark because she is afraid it will stick in the kids shoes and track onto the apartment carpets. I think sawdust would be the same problem. Any other ideas? It is only about 15 X 20 ft or so. Thanks for the help guys.