Realistically, I would grieve the loss of my children, who would never be born if I didn't line things up just right to cause them to happen again. I'd spend more time with my parents, who are getting along in the years, and I'd make the most of my time with them while they're healthy and happy.

There are a few specifics where I'd try to get some loved ones out of trouble before some critical tipping point that would later cause a bunch of heartache and stress.

There are general things about money and politics I'd probably do differently, knowing about how stocks have performed and what not, but that's not super interesting to me, because I'm mostly content in my personal life (including my career) and wouldn't want to upset that balance by doing anything too different from what brought me here.