Journalling is a great idea-- and that is exactly the reason we have a blog -- to remember stuff. Otherwise it all becomes a blur. With a narrative and pictures, it is amazing how much clearer our memories are, compared to the old days with no trailer and no internet.
Years ago, we did have photo albums, but they were so limited that they were almost useless. Now, with the blog, I can go back and add details, I can change the text, etc. We refer to it all the time when we are making travel plans.
If you have a minute, click on the "trips" link in my signature, and see if it is similar to what you have in mind.