Ahmmmmm, let me think ..... My kids have left home and are well sorted and my first wife and I don't have any debts......so:
1. Not tell the first wife I'd won
2. Talk to a certain boat builder with a view to building me a 45' displacement catamaran with two 160hp yanmar diesels, 2 X double staterooms, usable galley, water maker, hot and cold water, freezer and whatever else I needed to live aboard.
3. Give the first wife the house and both daily drivers in return for my freedom.
4. Buy a block of land on the water at The Town of 1770 or Hervey bay & build a huge shed to store the cobra and bits and pieces.
5. Advertise for a one or two female cruising "friends"
6. Invest the Balance of winnings.
7. Take my time cruising in the boat from the Queensland border north to the cape. Don't wanna go south of the border.
You think I'm joking don't ya?