Cool giveaway! Have not even played this yet, but seen footage of the game of course.
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Fallout really needs wastelands, and all are set in America.
So for America I'd say Florida, it's quiet diverse, Disney World / Spanish elements / Big city / Swampland.
If in Europe I'd say France, it used to rely on 90% nuclear generated energy. The city of Paris has a lot of history and historic buildings. And outside it has a lot of forests.
Thanks for the great giveaway, @Snollygoster I would love to see a New Fallout set to my own country: Norway. From fjords and sea to high Mountains.. it seems Perfect to explore Fallout-style