I write about my day. I write about my feelings. I write down 'little things' or 'inside jokes' that I would never remember otherwise. I tape tickets and receipts and programs into the pages. I don't have the money or space for souvenirs, so these tokens become them.
It is hard to stay committed to it. I am usually very good about taking the time to write every day... but on my last trip, I did not do very well. I was having fun.... I was reading Game of Thrones... I was lazy. I could beat myself up about it, but why bother? I tried, and at the end of the day, I still have most of our trip catalogued.