It’s common to take along a camera or cam-corder along on your trip but many people will keep a journal also. It’s nice to have something to go back to and read about your adventure many years later. The problem with keeping a journal is when do you find the time to write in it? It is easy to write a few paragraphs everyday before turning in for the night or to add to it occasionally throughout the day. Although the more detail you dedicate to you journal the more time consuming it will be.
I find taking along a small hand held tape recorder is a good way to preserve your memories. It takes less space conserves time and is much more convenient. You can add to it as frequently as you like throughout the day without missing anything. After your trip has finished you could then transfer it to CD or even type it out for further reference years latter.