First I would tithe 10%, and invest 10% (which would be 1 million for each). Then see if any of my friends or immediate family needed money.
If not then I would buy 30-40 acres and build my own castle. Not a gigantic one, but modest with 4-5 bedrooms, a basement, two stories, and it has to have two towers and parapets

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Then I would partition off the land into large enclosures for pets! Get a gharial, 3-4 small clawed otters, a caracal, cheetahs, clouded leopard, a bongo or two, maybe a komodo... If I have a couple million left over after that I would build large outdoor enclosures for my boas and carpets.
Then whatever is leftover will also be invested. Oh and I'd definitely need to buy a squeeze cage, some Nelson automatic watering bowls, build night houses, shift areas, perimeter fence...