Heading to Germany

One of the elemental things that I love to do is travel: anywhere new really.  I'm fortunate to have a job that allows for some occasional travel, and I'm getting ready for a trip to Germany for a conference and then for some siteseeing. My wife and boy are joining me in Koln after the conference and we will get to ride bikes and check out the vineyards along the Rhine and Mosel rivers.  I hope to do a good deal of running as well. Blogging? Perhaps, but I'm still trying to get my head around the difference between using a blog, posting to Facebook, and having a private (hand-written) journal.  All three?