Emulators definitely should still run fine for GBA games I'd think. So there's a lot to choose from already in that library. If not, then SNES. even a potato from the mid 2000s can run SNES games.
Other than that, I'm thinking I would load up my entire calibre Epub library so I can read books. I have so many books I want to go through that I have collected over the years. Want to go through the entire Dune series for the first time among other books.
I'm also quite certain a mid 2000s office PC can run VLC. I have many older series I have yet to watch still because I've been so busy. Stuff like The Shield or The Wire that I have downloaded but never got around to watching.
I don't think I would get bored without internet for 12 hours at all with all that media at my disposal. Even on a 128gb thumb drive, I can easily bring in 2-3 full 1080p tv series. Epubs and retro system ROMs take no space at all so that'd be easy.
And if I get bored of all that media somehow, I'd just use an offline copy of wikivoyage to plan my next vacation.
The "no u" style of conservative arguments is so tiring.