Here are some ideas:
The Childrens magical Garden on the Lower East Side has Hula Hoops
By storing play equipment with Special Needs neighbors in mind you add inclusivity to your garden.
For kids with cerebral palsy, muscular dystrophy, or any condition that affects the motor systems, look for toys that work with their limited movements. A good choice if he uses a wheelchair: the Infinite Loop. It increases upper-body dexterity and concentration as he opens and closes the tracks to keep the ball on its path. Two balls of different weights, for two difficulty levels, are included. ($23.85; munchkinfield.com)
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This chest, store Bryant Parks Recreation objects
This cabinet stores recreation objects at Rockefeller Park