Nope. Writing. And researching.
I've got a couple layers of what I call texturing that I'd like to add to my new ms and I want to make sure they have the ring of authenticity. So, after a couple of hours of writing, I hit the books. Yeah, I know I write fiction but research is still critical to make sure the world I am writing about feels as real as it can be--that every reference, metaphor, allusion made by my characters is done in the vocabulary of their environment, informed by their interests.
In the last couple of years, I feel that my understanding of and process for revision has really evolved. And research has been a part of this development. The more I feel that I know what my characters know (not just about feelings or backstory, but about actual things--sports, hobbies, foods, television shows, whatever), the better I feel I can represent them on the page.
It's a time consuming step, but sometimes research can really shake a creative knot loose, too.
How do you fit research into your creative writing and/or revision process?