My personal fantasy always has me going underground for about 10 years, then coming out once any violent purges are over, well-rested and ready to repopulate. Resilient, like a cockroach.
I always think that particularly when I watch "The Walking Dead." I'd just find a nice bomb shelter and try to write my the great American novel for about 5-10 years. No trying to seek out other survivors, no trying to rebuild, etc.
I mean, I'm pretty introverted (and also very overworked at the moment,) so really that just sounds like a nice vacation. Maybe in reality I'd get tired of it pretty quickly. But being bored and lonely for a few years still beats ending up as cannibal jerky hands-down.