Maeve Millay hands down.
I would create some sort of high fantasy world where the hosts were elves and orcs and dwarves and there were quests where you fought a dragon or, even better, could ride a dragon. There’d be castles and endless forests and magic and it would be all my nerd dreams come true.
If we’re going with actual historical periods? Renaissance Florence. You could assassinate a Medici or have Botticelli paint you or something.
I’d design a science fiction world and populate it with aliens that actually look alien instead of rubber forehead people.

