Buy a relatively nice piece of land that can be farmed, and is fairly obscure, and setup about 20 computers in it. I'd continue to create programs & maybe try and get some research published. And just generally have a fun time. Asides from the basic necessities I doubt I'd actually buy that much...excluding rent and living costs, I only spend around £1K/year on non-essential stuff like games, clothes, books, etc, even when I could potentially spend more.