Go to Magic Kingdom!! Lots of people won't go because of the rain. Grab a couple of ponchos and hopefully you will be walking onto most rides in a little while. Have a good day!
I second a trip to the MK. We've found rainy days to be great - lots of people don't bother going and lines are short. Rain ponchos don't keep you completely dry but who cares when it is warm out! Hope the all day rains are this week - we are flying down on Sunday to OKW.
Have fun!! We just returned yesterday afternoon. Rained all day Tuesday and was pouring when we left on Wednesday. We did spend a few hours at EPCOT on Tuesday. We never got to use SAB during our 3 day visit at BCV.
Have fun playing in the rain! I've read some live reports this week that have said lines are short, go to the parks, splash in puddles and have a great time