The other day, before leaving Syacho's house, Mark and I borrowed his bike and biked around the area. This was accomplished by Mark biking and me standing on the one foot peg in the back, or vice versa.
We found a kid's park composed entirely of sand and tires. Filthy, really, but pretty fun. Some of the tires were made into huge shapes and play spaces, but most were loose and the children could build with them or slide down a huge concrete berm with them.