Oh, I would do sooooo many things. I’d mainly be sensible about it, though. Money can’t buy you happiness and such, but it damn well can make life easier.
I’d buy a house somewhere out in the countryside, all paid off and everything. A place to live, but also a place to fall back on while doing other shit. I’d either quit my job or drastically cut my hours for at least a year or so to go traveling. There are so many places I wanna see, on and off the beaten path, new and old. I want to go back to Edinburgh, for example, but I also want to visit Scandinavia, and go to the US, and visit New Zealand, and Mongolia and, and, and…
I’d buy some other things, car, good computer/entertainment system throughout the house, many books, more geeky shit, stuff like that 😀 And I would spend it on my family and friends, help them out if they have a tight spot, stuff like that. I’d also look into good community efforts/programs around where I live to see if they need a hand, financially speaking. It’s good to give back to your community.
Then after traveling and re-settling in my shiny new house, I’d go back to school (linguistics, or maybe sociology or, or, or…) Also, work on all the various creative things that I like to do. And I’d like to open up a small shop with fantasy/scifi/geeky/and-so-on books, related merchandise, maybe some cd/dvd/games. And cupcakes. Basically a one stop shop for all your geeky needs.