I used to keep one for all my saltwater beach fishing.
I then forget to note it or be to tired when I got home to do so.
Once you start getting the beaches dialed in regarding tides, it get pretty easy to determine what tides will produce and which will be a bust.

I do agree with Doc on the sentiment value. My best friend and I have fished together for over 40 years and have had many great times. We both bring up things now that one of use remembers and the other one can't recall.
SF