One thing I started doing this year was keeping a small notebook with me at all times. I decided to do this so I could keep a record of all my thoughts and ideas down. I'll write down things I hear that make an impression on me, things I want to remember, lists, drawings of creative ventures I want to pursue, etc. It's something that I really enjoy and that I have found to be really helpful and relaxing for me.
(A mosaic of notebooks. Found here.)
Something I think I'm going to add to this documentation of thoughts is my consumption intake, my waste output, and other little notes on my environmental impact. You could start this documentation by making your own notebook, which you can find more information on here.