Nation's First Adventure Park Inspired by TV Show Is Among Latest in Wave of Non-Shopping Tenants Set to open in July in Santa Ana, California, American Ninja Warrior Adventure Park is modeled on the popular obstacle-course TV competition show. (American Ninja Warrior Adventure Parks) The nation’s first American Ninja Warrior Adventure Park is slated to open next month at MainPlace Mall in Santa Ana, California, as retail center owners nationwide ramp up strategies to get Ama