If you’re not alone, I say Mad Libs. They get old quickly, but it’s at least one activity you can do. If you’re alone or with others and provided you have a semi-modern stereo with a CD player and/or MP3 jack, I’ve found that stand-up comedy routines (of people you think are funny, duh) can really pass the time. Some people like books on tape (or CD now, I guess), but I prefer to listen to Mitch Hedberg crack jokes for a couple hours. That’s just my preference. I’m sure you can buy or download something good.