A natural playground?

Tonight I went to my first PTO meeting. It was against my better judgement, but I went because I thought it best that I enter the school with a positive connotation, rather than the pesky mom I feel like I've sometimes become.
But low and behold, there may be a reason I was there.
One committee that is looking for volunteers is the playground committee-- a group of people who are going to help plan the playground at the new elementary school that is being built.
Maybe this is my chance to put in a HUGE plug for "natural" playground equipment.
What's natural playground equipment? Great stuff.
Trees to climb and run between.
Rocks to turn into mountains.
Logs to walk across.
etc.
The creative benefits are enormous. A slide is a slide is a slide, but a giant rock is a pirate ship, a house, a giant egg, anything.
The hard part is going to be convincing the others on the committee of this wonderful idea. I'm trying to figure out how many copies of "Last Child in the Woods" I can hand out at the next meeting...