I think it's important to keep the lists in this journal small, because when you cross a completed activity, you get a sense of accomplishment & expansion, as opposed to overwhelm, which is what happens when your peripheral vision catches the remaining twenty bullet points that look like clutter.
12. Dream Interpretation. Although I record & interpret dreams in my regular diary, plenty of people dedicate a whole journal to that task. There are periods of time when my dream life gets so epic and convoluted that I do ask myself whether I should move the whole thing to a 'bigger place' of its own, but I haven't made that step yet. Meanwhile, I drool over other people's dreams journals on youtube ;) And one more fun thing: if you're a fiction writer, your dreams are always great sources of outrageous ideas.
13. Gratitude Journal. This helps you focus on what makes life worth living, from the tiny details to the grand events. When I first started on my path to recover from depression, the number one thing I did was get myself a notebook for the sole purpose of writing daily gratitude lists. When I re-read that now, it feels kind of embarrassing because the items seem so mundane ("I'm thankful for yogurt", "for pens", "for X tv show") but that's what it took at the time to open my eyes to a brighter life. Best project I ever did, wasn't it! A book of pure positive focus!
14. Travel Journal. My mother taught me this habit. In my family, travel journals aren't a one-person task; it's a collective activity. My mother used to curl up in a ball in the car or caravan, and scribble like a maniac in her travel journal. Every couple of minutes she would jerk her head up and ask "What did you guys think of..." and she'd annotate everyone's impressions about a single event. Now that I travel on my own or with friends, I'm the one bringing the notebook along, and I make sure to include the experiences of those who are coming with me. Oh the lols! My travel journals are particularly hilarious because I tend to write them in a mixed style of satire & surrealism. Doodles & quotes are also imperative, as well as physical keepsakes.
Not only are they fun to read afterwards, they're also practical tools for future trips. Thanks to recording past experiences, now I know how long it takes me vs my companions to pack a suitcase, and how long it takes to get to specific airports, & what to expect from each security system around the continent, & what I typically spend in every european city, & how to catch different public transportations depending on where I'm landing, & what are the best deals, & what trouble we got into and how to avoid those situations next time, and much more.
16. A planner. I use them during crazy-busy eras of my life, but nowadays I keep bullet journals. Sometimes I wish I had a busier life just to have enough material to put in a planner ;)
17. Alternative Universe / Inner World. This is where you document the lives, personalities and looks of your imaginary friends, as well as the lanscapes of the world inside of you. My favourite methods to get in contact with that place are letting the characters narrate in first person, making them write letters to each other & lots of sketching/watercoloring. I used to believe that I had many different worlds inside of me (one had pink skies, another had green skies: they looked different) but after reading The Pixar Theory I think it's just one world inside of me -and the color of the landscape changes depending on what side I'm looking at ;) Exploring & documenting your inner world promotes creative thinking, and helps you unload strange information that lives in the back of your brain but that doesn't seem to have anything to do with "reality". And it's a place to contact your muses too.
I found this type of journal extremely helpful for self expression when I was in the midst of depression a few years ago. I was too afraid to write down what was truly going through my brain as well as what I was doing to my body, for fear someone would read it and 'find me out'. So everything got channeled through alter egos living in an alternative universe. If someone were to read this journal, they'd think it was fiction, so I was safe. This is a safe haven away from "reality". However, I have found that my inner world and the real world are extensions of each other.
Tip: Sometimes I use prompts that help me dig into the inner world and bring up issues I hadn't explored before.
19. Reading Journal. Like Goodreads, but on paper :) I make my own cheap version by copying the sections of The Book Lover's Journal.
20. Penpal Journal. It's like sending and receiving mail despite the fact that you live one street away, and without having to spend a cent on postage (unless your friend lives in a different city). The idea is that each person keeps the journal for a specific amount of time, fills a few pages with their own creations and then passes it on to the next person.
I've been involved with written journals, where one person would start a story and pass it on, and thus a novel would be created by the different people participating in the project. And I've also done group scrapbooks which, as the word suggests, consist of one person pouring random stuff + handwritten letters into it, all with the next person in mind. It's one of the most fun & bonding projects that friends (and lovers) can do.