1. I would time travel 10 years from now and see who the top tech companies are. I would then come back and wait for those startups to appear and you know what I am doing next :)
2. I would travel back to somewhere around 1993ish when no one knew Jeff Bezos ?? and convince him that I would like to back his startup idea of selling books. I become a lead investor in Amazon and then come back to 2020 :)
3. I would go back to the times when religion was invented and then try to uninvent it (controversial I know). Nothing against faith in general but most religions have caused misery and pain over the years in the name of God.
4. Time travel to the first time fire was invented and watch the reactions just to get a kick out of it. Time travel to the first time when the first light bulb was invented and tell the guy he changed the world :)
5. Go back to the time when my dad was healthy AND try to convince him to eat better and exercise so he could hopefully live beyond 70 (he didn't) and spend time with his grandchildren.