Weather insurance for your vacation?
A light drizzle as you arrive for check in at the hotel won't be enough to get a refund on your vacation. In order to get your money back it will need to rain at least a half an inch on half of the days you are on vacation, with the rainfall amount being recorded at your destination's airport. Even though it should go without saying the "Sunshine Guarantee" only covers those services you book through Priceline.
I wouldn't recommend spending extra to purchase weather insurance for your next trip, but if you can get it for free by booking through Priceline and still get competitive prices on your vacation you may as well take advantage of the extra protection. Even though the offer will refund your money it can't refund those vacation days you burnt to get away so be sure to check out DryDay.com which will help you find the best day to have an outdoor event. Then again, if you vacation for museums and culinary delights rather than outdoor activities you might be able to use DryDay.com to figure out which dates would most likely net you a free trip!