Simple observations about walking, making things, and paying attention.
A short note is easier to return to when it has a date, a clear subject, and one concrete observation. A sketch or a few words can be enough. Leave room for questions instead of trying to finish every thought on the first page.
A familiar walk changes with the weather and the season. Look for the shape of a tree, the direction of a shadow, or the sound of water. Following the same route occasionally makes those small changes easier to notice.
Keep a project small enough to finish in an afternoon: mend a loose handle, organise a shelf, or draw a map of a favourite walk. Write down what worked and what you would change next time.