Discover some new music. Last.fm seems to do me a good job of suggesting similar artists.
Try out some o' them indie games. Browse some old Worth Readings.
Sign up for Netflix or something. At least try a month, I keep it around for Futurama, IT Crowd, and Breaking Bad.
Revisit some of your old games, if you got 'em. Go on a trip down memory lane. Vagrant Story for me.
Try something different. Maybe see if you can cook something with what you've got. Pick up a paper and pencil, see if you can improve your drawing skills.
Take a nap once in a while. Cash-in on some of that sleep debt. Why not?
Plan what you're gonna do when you get back out. Seriously, this can be fun. "I'M FREE BITCHESSSS!!!" Maybe some lasagna is in order. Or maybe you should just make some time to sit on a park bench, in quiet dusk, slowly gazing at your surroundings. Arrange a meet up with your local homies who were locked up too, maybe?
Dig up one of those things that you meant to get around to, but you haven't. Like that book, move, game that you bought, because you thought it sounded really cool at the time but forgot because of life's distractions. We've all got some of those, right?
If you're a guy, see how far your beard can grow.
Get some cleaning done. Word.
Wouldn't suggest drinking. There're probably better ways to savor your time off.
Do something ridiculous in the privacy of your own home. Like wearing a clean pair of underpants on my head while I went along with my business.
Improve your words-per-minute. There are a TON of typing tests out there on the internets. Might I suggest Z-Type?
That's about all the not-so-directly-related-to-games activities I could muster for now. Hope you manage to enjoy your extended weekend, even if it is going to take some effort.