What would you do with it? I already have it spent.
I would commission
a bus, that's right commission as this would be masterpiece of engineering. Any structural metal would be either stainless or aluminum. The very forward section would be observation deck/dining room/ entertainment room with a substantial kitchen. Of course it would have the high tech goodies like wide screen TV, audio both inside and outside the bus. This middle section of this bus would have one master bedroom myself a few bunks for freinds and family and two nice bathroooms. The rear section would carry all the toys like a few quads, fishing and hunting supplies, camping equipment, tools, large quantities of fuel, water and sewage capacity.
On the outside of the bus we'll have complimentary kitchen, grill etc. Pop out tables etc. All kinds of push button stuff. Just hit the table button on the big giant remote this bus would need. LOL
The trailer this bus would be towing would have one big ass boat, Humvee, canoes kayaks and whatever else I could stuff on it. The top of the bus will double as big deck complete with push button awning.
Once all that was bought on and paid for I'd put about 10 million away for myself then distribute the rest of to my family and hit the road. Destination?.... WHO CARES....