There are many ways to utilize Hive. As a "diary" or sorts or a way to "think out loud" are both viable alternatives.
You could use the pages to link to yourself to create an total product where you have it all tied together and not just an assortment of posts. That could be coupled with other media as you stated like photos and videos.
Now you are doing something rather unique and, in my opinion, scalable. There are few limitations to what you can include. I would think the ideas will start flowing to you as the process starts.
Think pages and linking them together. What can you build?
Time will tell. We will see.