Wow, you behaved enough to get privileges to go outside? Man the light must hurt your eyes from being locked up so long, huh?
Well, enjoy the fresh air while you can, only the well-behaved patients are allowed out here. The guards have a tendency to take naps rather than do their jobs, so escape could be an option?
Also, if you can sneak out then you can at least feel the grass under your feet until they drag you back inside.