It's easy enough. Buy a poncho and walk! Back when there was free Disney on your Birthday a year or two ago, it poured all through the morning and afternoon and while tourists cowered, I did EVERYTHING I wanted to do in that park and MORE! The longest line I stood in was for LUNCH! Crazy! Buy a poncho and act like a native. So long as there isn't lightning, it's the best time to visit! Besides, one of my best Christmases was a rainy, cold day at a practically barren SeaWorld! Rain + Theme Park = Fantastic!