Outdoor Instruments on Pinterest | Music Wall, Musical Instruments ...
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let the children play: take music play outside: part 2
Have the rods in the ground, numerous shaped objects with holes in, kids create their own totem that can change every day. Easy.
20 Fun and Frugal ideas for your Backyard this Summer - In The Playroom
@Steve O'Mara, this looks fairly easy, and there are lots of tips/suggestions for fine tuning. Ro would LOVE this!
Play yard abacus. I would set this up with baskets for natural materials (pinecones, rocks, etc.) nearby.
Except I would place in the ground level....Easy DIY Rainbow Paver Hopscotch