My wife so I would have my best friend with me on the journey.
Pictures, Photographs, and memorable items. :-D
Uhhhhh ... tough question. 🤔
I think I'd have to go with a mirror. Despite space not being an issue outside whatever capsule we'd be living in (pun intended ;)) I think I'd feel a little tight indoors. Mirrors are well known for making spaces feel ample. Plus, it's something I've never seen in any of the NASA videos
Deck of cards! Lots of different games to pass the time. Maybe even invent some new ones!