If the rain isn't so heavy that it makes driving dangerous, consider taking a road trip. Drive to things you can see from your car or better yet, see if you can drive far enough to escape the rain entirely!
West Virginia is well-known for their insanely tasty Golden Delicious apples and they're a great treat for your dogs too. Take a trip to the local farmer's market or grocery store and find some, then sprinkle a bit of cinnamon on top (both are dog-friendly foods). If you're feeling really adventurous, you can make an apple dumpling as well, but make sure they only get a taste-- sugar and flour aren't good for dogs, especially in large quantities.