You may notice some options for Magical Diary and Dream Journal in the back end soon. These are still in beta.
The Magical Diary post-type has custom fields based on the diary fields suggested by Phil Hine in Condensed Chaos.
Dream Journal will be more standard like a regular blog post.
These are not thoroughly tested yet from a privacy standpoint so use at your own risk if you post any sensitive info, and pay attention to the settings in “Publish > Visibility”.