Among a number of other unique spots featured on AOL I found the Point No Point Lighthouse - complete with a lightkeepers residence this site is available for vacation rental at only $215/night + tax.
The Lighthouse dating back to the 1880's is about a hour from Seattle. It provides a bird's eye view of what goes on in Puget Sound and a view of Mount Rainier.
From a Seattle Times Review it sounds like an awesome place for a weekend retreat for writers.
Where are some places you have gotten away to write at and how did the writing end up? Tell us about your successes or otherwise....