I use Excel too. Been keeping a log since 1996. Shows me what day, who I went with, what lake, how many days there, notes on fish caught and technique, and notes on boat repairs or damages/lost equipment. I then sum it up to see how many days a year I go, what lakes I've been to most, etc.

Nice thing a bout Excel is that if you want, you can add columns for each trip to show gas costs, bait cost, boat repair costs. That is smart business cause it can help you to balance how much you are spending on fishing.

Doing that, I found out trips to the Ohio River cost me less, yet net just as many fish, as when I take a trip to Barren, that normally costs me more, and nets no more fish. Of course, some lakes choices are based on what I want to fish for, hybrids, cats, Stripers, etc. But just knowing helps me to keep costs in check and still have lots of fun.