If I won the lottery, I'd...
-Purchase a large plot of land with some big, old trees here and there and small, rolling hills.
-Have a comfortable house built for me and two buddies--think 2500-3000 sq.ft.
-Hire an architect to design an uber-garage, with enough space between its 40 parking slots to open
both car's doors wide open.
-Hire a reputable contractor (Der Alta?) to build this garage on a specifically planned location.
-Hire a famous racetrack designer to plan a good track. This step will take a while.
-Get somebody to build it.
-Make sure they don't forget my gymkhana with sprinkler system.
-Buy a '95 Civic hatch and build everything, especially the B18C making ~220whp at ~9000rpm, with a limiter at 9500. And a lisence plate saying "220HP9K".
-Master it and the track.
Now don't think I've forgotten about the obligatory trip to the Nurb, Monza, Everywhere. I'd get my laps in somehow. I'd also enjoy a pilot and boating lisence, the latter of which is highly attainable. I'll have the F430 Challenge, the 599, the GT3, the SRT10, the Miata, Gallardo Spyder, R34, Turbo, GT, Z06, Cayman, MR2, S2000, RX7, NSX, and Escalade. Yes, a Slade. Allllllll pimped out. I'd track down a few cars I especially love and want. I'd help out some people the parents, the family. I'd try my hand at learning German once again, and spend some time there. I'd attend all sorts of racing events and the like. I'd try for a girlfriend.
I'd invest in stuff and make money off my money. I'd do lots of stuff.
Cars and racing would be my focus, but I've actually thought thoroughly about this stuff. Dreaming is a great way to pass the time.