Doze. Read. Watch TV. Feel sorry for yourself. Pull out all your music and put all the numbers in a spreadsheet, or rip them to MediaMonkey, so that you can find them easily (assuming you have enough memory). Badger your partner to buy you more memory. Put on your earphones, much more introspective than 'speakers. Pull the side off you conputer and blow the cat-hairs from the heatsink. Try to learn that instrument you bought at the folk festival, and have never tried. (Ocarina? Swanee whistle?)) YouTube, if your connection is fast, until it isn't. Facebook. CD Baby. 'Make 'em Laugh.' EBay. Look for folk sites in countries where you may go one day. Spider Solitaire. ASS lv. That's right, it's in Latvia, but it has English 'Joki.' Google 'dictionaries.' Google yourself and your friends and relations.
I'll admit when I'm ill I only ever do the first four, but I THINK about the others.