The first thing I do is ensure I'm not writing crazy hours to the point where I wouldn't be able to tell quality work from just grinding the millstone. Burnout is no good for your writing. (Take a breather, E.C.!)

Then I put the script away for a couple of months and move on to concept work for the next one -- roll projects so I never get stuck rewriting one into the ground. I rewrite the prior script after finishing the first draft of the new one.

Oh, and a nice fat bowl and a good dinner with friends helps me remember to enjoy life. Hell yeah.

How do I decompress after I finish writing something? I start writing something else.

Drinking in public with people who don't write.

I play cards, poker, specifically.

And I GO to the movies. And read a book I'll know I'll like.

How do I decompress after finishing a screenplay?

I start two more and theorize on why I did it the way I did it.
Then I post to my blog.

I clean (vacuum and dust) my apartment, because I won't let myself do anything other than dishes and keeping the bathroom tidy when I'm in the middle of a script. Then I go see a couple movies in the theater. Then I start working on something new.