I don't but I've had to keep mini-diary type things on some trips when I've done them for school and logs when I would do science research class. I've though about at least keeping a journal for when I travel because I regret not having one for my private travels like I have for my school trips. I'm planning to at least write the places I've been so far on my own and write down the stories I have as I remember them and then I'll just write new ones as I go.
And then I've started a bullet journal recently. Just for figuring out things I want to do with my life, where I want to go, writing down books I've read and things I like, etc. Not a diary diary but still diary-adjacent.