It could be anywhere in the world, at any venue, check in is 8 am and check out is 8 am the next day. No you can not break into wherever you choose, it's done legally lol.
Oh, that's so easy for me, I would love to be in Disney World. My last trip to Disney World was in 2004 and it had to be cut short due to a hurricane. I miss Disney World but it's not like I have $5k to drop on a vacation for a week. So I doubt that I will ever be able to go back in my lifetime.
This is a tough one for me as there are so many places I could choose.
If I could only choose one place and had the option to spend 24 hours there, it would have to be Warner Bros Studio Tour London also known as the Harry Potter Theme Park