The log thing can be anything you want. a few issues ago in Singletrack a guy kept a diary of all his rides fir a year, just a few lines. Made interesting(ish) reading. So even if you want to post 'rode to work and it pissed down/saw a cat/hated it/loved it' whatever you like. It means you can look back at the end of the year and reminisce, since we are a nostalgic lot.