I love the journal! I am halfway through so I use it more sparingly now. I am interested to hear others creative uses for it. For me though, some quick examples off head:

Started off with day by day overdramaticisms on my battle endeavors
Day 1: "the road to victory is paved with wharf rabbit blood!"
and do's and don'ts guides for my classes, so I could share my wisdom one day
Dos and Donts of being a Pugilist:
Do: punch things in the face
Don't: stop punching them in the face

then i started writing down crafters and NPCs of interest, and leves to avoid like the plague, and good craft recipes
somehow then evolved into a quote book
"whats life if you never pull down your shorts and slide on the ice!"
"it's not whether you win or loose, as long as you come in first"

now I kinda just doodle players and cool looking gear I see, and write random things that cross my mind, since most helpful game knowledge is burned into my memories eye