When you do different things, you think different thoughts. And if you feel like your writing is in a rut (or that you yourself are), then take a vacation and do something different.
My notepad of ideas invariably fills up when I do different things. It is so beautiful. I give myself time to do things, and enough free time to digest the experiences. When I remove myself from the normal distractions, all I have left is the desire to write.
I will work on new projects, pick up old ones left too long on the backburner, and brainstorm ideas for even more.
The power of vacation is undeniable. It's a shame we can't do it more often, but don't forget to do it at least sometimes. Just remember, you're only a writer on days you write. You may be on vacation, but keep making words.