Keeping a science log or journal can be a very useful thing. They can help you spot patterns that you might miss otherwise.
For example, Nancy keeps a garden journal, and it helped us realize the every year, the first Black-Chinned Hummingbirds migrate into our area on the same day. A journal can also help you remember things, such as the location where you saw a specific wildflower, or who was with you when you got your truck stuck in the sand.
I tend to use photographs in my journal, partly because I enjoy nature photography, but also because each photo has information embedded in it about when and where it was taken, which lens I used, what settings I used, etc.
I thought it might be interesting to start keeping my journal online, so you could see what is happening here in Johnson Canyon, and as an example of how you might keep your own science log.