I've just returned from almost a month of fall camping in Quebec and let me tell you, there was plenty of rotten weather. Have you ever returned from a vacation plagued by rain with barely any photos because you hid inside the whole time? Some of my very favourite (and most popular, and lucrative) photos exist only because I got outside despite the miserable weather.
Here's an article I wrote about what to photograph when it rains on your vacation. Coincidentally (not really), I wrote it in a tent in Forillon National Park, Quebec, while the rain was beating down outside.