1) Find the largest lotto Jackpot that didn't have any winners, buy a ticket, select my numbers.
2) Go back to 1976 and purchase the Spirits of St. Louis, a basketball team that no longer exists and hasn't since 1977 but negotiated a deal for one-seventh of broadcast TV revenues from the NBA indefinitely forever and got paid about 17 million dollars a year for no reason whatsoever up until the owners made the NBA pay them 500 million dollars to get out of the deal. To be honest I never would have let them off the hook. This whole thing is far too hilarious. I would have kept collecting my check.
3) Go back to Germany in 1888, buy a Kangaroo (the animal with the strongest kick of any animal on earth besides a Zebra but you can't train Zebras, they're a**holes). Teach it to kick people in the nuts with incredible precision, let nut kicking zebra loose in Alois Hitler's house about 9 months before what would have been Hitler's birthday.
4) Same thing, but for Bruno Mars' dad. Given the evolution that's taken place over that century I would assume Kangaroo kicks to the nuts became much more powerful over time which is excellent news. I probably should have gone with some serial killer or terrorist here but nope... Bruno Mars. I already did my good deed for humanity on that fateful night in Germany in 1888.
5) Start a coaster design company in the late 60's and create a coaster that's absolutely loaded with unnecessary trim brakes (let's call it... Intimidator). Quietly file a patent for trim brakes. Open a store called "Koasterbll's Krazy Trim Brake Emporium". Wait for B&M Hypercoasters to hit their stride and then mark up my trim brakes 500%, making windfall profits. When they try to get around the patent, sue them for all their worth with the same brilliant team of lawyers that keeps crushing the NBA's hopes to get out of my spectacular Spirits of St. Louis TV royalty contract. Spend my days counting money on the beach in Hawaii.