Plastic Playground Equipment, Outdoor Play, Playground Accessories – The Adventurous Child. I also like this for an inside playroom wall. Use large metal sheet. Then attach magnets to different size pipes for an build-your-own ball ramp contraption
Backyard Play Ideas Stress free Summer Play Outdoors
Ideas for creating Outdoor Playspaces & Activities for Home Educators - Mummy Musings and Mayhem--since the kids have pretty much trashed the yard. play areas could be separated by "tracks" for bikes & their quads.
10 Projects to Transform Your Backyard into an Educational Oasis -