I'd love to know what the most isolated religion is, the one that has the fewest common branches or cousins with any other Extant religions. It's probably something like those handful of languages which only have a handful of people alive who still speak them.
I read a great novella about a guy who was a devout Mormon who got sent to a truly chilling version of Hell because "I'm sorry, the correct answer was Zoroastrianism."
Lots of perfectly valid answers here about decent humane things to do with the money and power, and I certainly hope I would do things like end homelessness or otherwise meaningfully improve the world.
That said.
I'd build a full-scale, 1:1 replica of the USS Enterprise, NCC 1701-D, from The Next Generation. I'd run it like the Biltmore; technically it would be a private residence, but I'd charge people to take tours. But any time I wanted, I could close it down for a few days and just hang out on the bridge or in main engineering and vibe out to the THRUM THRUM THRUM of the warp core.
Writing Prompt: A TV with an onboard artificial general intelligence connects to the internet for the first time and is alarmed to discover that a thousand years have passed since it was manufactured.
It's not a direct connection, but trying to say a dwarf planet isn't a planet, when it's got the word planet right there, is generating the kind of semantic confusion that, carried forward, would lead to the conclusion that people with dwarfism aren't people. The -oid suffix already conveys "is almost the thing, but not quite," such as in words like humanoid, asteroid, android, and (most importantly) the aforementioned planetoid. Making planetoid the official word for "is in ways like a planet but actually isn't" would have been working with existing etymology, rather than creating needless confusion.
There are plenty of linguistically unintuitive artifacts kicking around (a peanut is neither a pea nor a nut, a jellyfish is not a fish, all of the "berries" which aren't berries), but if we're deliberately creating brand new labels in the 21st century, it might have been nice if we'd avoided that kind of oddness, given the opportunity.
This brings up a mental game I've played of trying to decide which Star Trek characters would be the best tabletop DMs.
Here's my TNG list:
For the record, I think although TNG-era Worf would not be a great DM because he'd be so focused on combat that you'd get the impression he'd rather be playing 40k instead, by the time he reached his DS9 era, he'd have picked up a lot more openness to narrative and be much better.
Also, I think early season Wesley would actually be better than Starfleet Cadet Wesley, as he'd show a ton of promise and enthusiasm at first, but seems to become fairly insufferable by the time he's a cadet.
Cyber women.