At my family BBQ this weekend my brother-in-law and I were talking about this very thing. He had a little book that he started keeping to jott things down that he needed to do. What really struck me is that the cover said "Field Journal."
I have kept a journal of sorts for many years, but it has really been for noting my feelings as I walk through something. I now carry a small "field journal" with me to capture even the smallest details God shows me. Including my feelings as I think about Him and His creation. I stand in awe of God and who He is.
Already I can see how much of an impact it is making and who knows where it may lead. I might have a small inkling though. Try it and see if it doesn't encourage you!