Zion National Park
ASeattle: How to deal with lack of sunshine in Seattle
First, you make the most of all the sunny days we do have! Second, you learn to do outdoor activities when it's crappy out. Third, microbreweries.
AGrand Canyon National Park: Any campsite suggestions for RV trip in Grand Canyon, Zion, Bryce, & MV?
If you're into free camping and can make do without a bathroom/showers, there is free BLM land that is popular to camp in about 20 miles outside of the Zion park (doesn't seem that far). You can drive south from the south Zion entrance and at Virgin there's...