Zoe Biskup
Zoe Biskup voted up Gator Blu's answer

I would go back to when I was about 23 and hand myself a copy of my marriage license. It would let me know the cheating jerk I was with wasn't the one I end up and would leave earlier and  save myself some heartache.

Zoe Biskup
Zoe Biskup voted up Ancient One's answer

I would return and deliver a rather lengthy note to myself listing the mistakes we made and which ones to correct and which one were beneficial. As well as a list of properties and lottery numbers.