Ways to feel productive when you haven't done much:
1. Go for a very long walk, but wear legitimate work-out clothes. You'll feel like you're doing more than you really are.
2. Shower. Extra points if you shave your legs.
3. Get over your fears of changing strings (this might only apply to me), and put new ones on an instrument. In my case, after nearly two years (gasp) and a very stupid mistake, I just put new strings I my cello.
4. Play the instrument.
5. Buy a rolling pin.
6. Use the rolling pin to make this very easy and delicious bread recipe. If my apartment is any indication, anyone's kitchen will smell incredible.
7. Play Scrabble.