First off- Now you have a great excuse to be stuck in the house, no guilt trips about taking advantage of the fresh air and sunshine outside.
1. Catch up on your reading, while listening to good instrumental music (Multitask)
2. Then write about what you just read, or the thoughts you had while reading (Multitasking again)
3. Waste some more time watching a great film from the "Classic Hollywood" Era...or maybe an International film with subtitles...so that you can read some more.
4. If your sharing the rainy day with your partner, I suggest exploring each other sexually too (You never stop learning)