My favorite thing to do on a rainy day is just to go out on the porch and listen to the rain. I grew up just outside of a small town, so we had a nice view of a little grassy hill and lots of trees. It was nice to sit on a covered porch and watch the rain. Actually, it turned out to be a great opportunity for everyone to just sit around and talk. My Dad is a good story-teller, so that helped. And if it was lightening we would always count from the strike to the thunder to see if we could tell how far away it was. Good times 
I remember listening to the rain/thunder as a child, as well as listening to the crickets on a summer night.
