I try to write something meaningful for each cache I find. For myself, there is a definite correlation between what and how much I write and the meaningfulness of the cache. So, if the cache is found after a nice hike through a unique natural area, I will write a lot. If it’s one of many just hidden along a biking trail, for example, I probably will only write a sentence. Most of the time, I do take a lot of pictures and try to include at least one with every cache I find, usually some kind of natural feature near the cache. Another factor that influences what I write, is that usually I do all my logging at night, after the kids get put to sleep, and if I have a lot of logs to submit, I probably will keep it minimal, unless there was something particularly noteworthy about a particular cache.
Also, my son has an account on g-c.com, but he’s only 9 and while he truly enjoys hunting down caches, at this point, he’s not so interested in logging them on the computer, so most of the time I do all his logs for him, and I’ve gotten to the point now where I just write TFTC! on his logs and that is it. His logs are always paired with mine, though, so if there was anything noteworthy, it will be noted in my log. As he gets older, and hopefully continues to cache, I hope he starts getting more into the computer side of geocaching.
