I add things to remember next time....or not needed at that accommodation.....(if we find a place we like, we tend to return

)
or things I've run out of and need to replace
I also write a journal of the holiday, this started a few years ago and has "grown", it's basically factual to jog my memory, and would be dead boring to anyone else, but has become a bit of a labour of love - some days end up with several pages to themsleves, and others just end up with a few scribbled phrases, especially the last day

It's quite fun to re-read in the depths of winter