You made a good choice coming on here to pass the time - lots of interesting stuff here.
I’ve had nights and days I’ve spent the whole day watching Netflix. It was a lot of TV but it kept me safe.
There’s a simple rule I use: you’re allowed to do anything that’s safe and legal, to stay sober. Anything.
Go for a three hour walk listening to audiobooks? Ok.
Eat pizza three days in a row? Ok.
Join a group you’ve never joined before? Ok.
Go camping? Ok.
Whatever. Your choice 
In addition to Talking Sober, meetings are a nice way to pass the time:
Resources for our recovery
Whatever you choose, remember why you’re staying sober. Drinking or using will always, always make things worse. You’re making a choice, today, so you can wake up tomorrow feeling good about yourself - and you deserve to feel good about yourself. You really do.