Honestly I don't think my life would change a whole lot. I don't think I'd be happier, but I would be less stressed. Build a nice house in PEI overlooking the water on my wife's parents property. Couple of cars, travel
a lot, probably 4 months per year. I'd give quite a bit to charity too. Probably spend some time in Africa doing relief stuff.
Other than that I would do the exact same thing I do now, except I would be more selective of clients. I'd build a little mix studio on the island, but I'd travel to work with artists wherever they were. Maybe start a label, just so I could sign and work with artists I like.
Whatever was left over I would split between investments, and music/studio toys. Probably 50/50 if it was just up to me. More like 95/5 if Julie has a say.