You can exchange bodies and life with a famous person for one day, who would that person be?
Beyoncé. Like, obviously.
To be fair there are a quite a handful of famous people and celebrities that I would love to switch the lives of for just one day, just to see what everything is like, but let's face it Beyoncé is pretty much the pop culture equivalent to someone of royalty. Everything she does is phenomenal, every time she appears somewhere people basically bow down at her feet; whether you love her music or dislike it, you can't deny that woman is hardworking and has made a huge cultural impact and is powerfully influential, you just gotta respect that hustle. If I were to exchange my life with hers for a single day, it would be like being treated like a goddess. I would also get a chance to see the everyday life of what she deals with on a daily basis, the expectations, the pressures, and while I wouldn't necessarily enjoy that side of the spectrum (since there is a price to fame) it would be fascinating to see these how celebrities in general actually are behind the scenes, no "reality show"-esque kinds of behavior in front of cameras or whatever. Just them, as regular human beings, dealing with normal things that we often deal with.
My second choice would be Shay Mitchell, not only since she's gorgeous as fuck, but also because she travels so much to such amazingly beautiful places that I would love to just exchange one day when she's visiting some stunning location, just for that luxury alone.