I would buy a huge house, half of it would be a music room, on a lakefront. I'd have an airplane and a big electric death ray to scare off salesmen.
Then I'd buy all the guitars I've ever wanted, and maybe a music store to run, just for the experience, and put the rest of the money in the bank and live off the interest.
I would also eliminate all the money problems of everyone I know that have money problems.