Many sensory elements should be considered when creating a successful space for an individual with autism. Here are some links: 

Autism Design Challenge Winners 

Calm/Peaceful Setting 

Yoga

Article on Sensory Interventions 

A Sensory Room On a Budget 

A Sensory Room 

Create a Play Gym Inside or Outside for Climbers and Jumpers

iAutistic Autism Friendly Room Test

Building a Sensory Room Article

General Sensory Room Article 

Personal Shopper (Sensory Store)