I take mine outside sometimes to try and get natural light photos, but it depends on the weather and temperatures. They do not go outside just to 'play'. Sometimes I take them outside to show others, such as when people have asked to see/hold a snake, and they go outside with me if I happen to have one out and I need to go outside for something - again, weather permitting. I own my property, and if anyone in the area objects to my snakes, they are welcome to not come on it... but since I own enough land to keep my horses on it, that's not nearly as much of an issue as it would be in a cramped city residential situation.
Edit - and I certainly don't take them out to play in the horse hay with the wild bull snakes.