One time when we went to WDW, I think it did rain the whole week we were there. All the rides were still open, to the best of my knowledge. The only tip I have concerns people who have little children expecting to see Mickey. When I was in the ladies room, wringing water from my hair and clothes, I heard this little girl complain to her Mother, "We haven't seen any characters today!" Everyone there laughed as the mother tried to explain to her daughter why a little pouring rain might keep Mickey and Minnie in. The only park that we found difficult in the rain was AK. Epcot and MK were no problem. MGM was OK, but we sat holding our breath in a sea of yellow ponchos waiting to see if it would let up enough for Fantasmic (fortunately it did). Oh, yes-one other tip and I speak from experience-DON'T self-park at the GF in the rain!