you pretty much have to buy properties to spend that much... and lots of them.

How about a small city ?

I'd buy an island off of the californian coast and withdraw from the united states, after everything was built and purchased. Then just go to the states for $4,000 worth of groceries every few months and live my life in harmony.

the other question is... if you bought a 1.5 million dollar car, how often would you drive it ? Daily driver, hell no !